If the number of events is taken as x then the inequality is:
[tex](200*4)+(x*25)\geq 1200[/tex] ( as there are only 4 weeks in a month )
If we further solve this inequality we can get the answer:
[tex]800+(x*25)\geq 1200[/tex]
[tex]x*25\geq 400[/tex]
[tex]x\geq \frac{400}{25}[/tex]
[tex]x\geq 16[/tex]
So, as we saw here, the minimum number of events required for Darlene to complete the goal is 16.
But she is planning to organize 4 events which is insufficient. She needs to organize 12 more events in order to satisfy the inequality.
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Let's first calculate how much Darlene will earn in one week by organizing four recycling events:
$200 (base pay) + $25 (per event) x 4 (number of events) = $300
So, if Darlene organizes four recycling events per week, she will earn $300 per week.
To reach her goal of at least $1,200 in four weeks, we can set up the following inequality:
4 x (number of events) x $25 + $200 x 4 ≥ $1,200
100 x (number of events) + $800 ≥ $1,200
100 x (number of events) ≥ $400
(number of events) ≥ 4
Therefore, the number of events Darlene needs to organize to reach her goal of at least $1,200 is at least 4.
Since Darlene plans to organize four recycling events per week, this means she would need to work four weeks to reach her goal. Therefore, organizing four events each week would be enough to meet her goal, as long as she works all four weeks
Question
In △ABC, AB=7.8 ft, BC=10.7 ft, and m∠B=27°.
What is the area of △ABC?
Enter your answer as a decimal in the box. Round only your final answer to the nearest hundredth.
ft²
Rounded to the nearest hundredth, the area of △ABC is 27.28 .
What is Area ?
Area is a measure of the amount of space inside a two-dimensional shape, such as a square, rectangle, triangle, circle, or any other shape that has a length and a width. It is usually measured in square units, such as square inches, square feet, or square meters.
To find the area of △ABC, we can use the formula:
A = (1÷2)bh
where A is the area of the triangle, b is the length of the base, and h is the height.
In △ABC, we can use AB as the base and drop a perpendicular from A to BC to find the height. Let D be the foot of the perpendicular from A to BC.
First, we can find BD using the trigonometric ratio for the angle 27°:
tan(27°) = BD/AB
BD = AB * tan(27°)
BD = 7.8 ft * 0.5095
BD ≈ 3.97 ft
Next, we can find the length of CD:
CD = BC - BD
CD = 10.7 ft - 3.97 ft
CD ≈ 6.73 ft
Now we can use the Pythagorean theorem to find the length of AD:
AD*AD= AB*AB - BD*BD
AD* AD = (7.8 * 7.8 ) - (3.97 * 3.97)
AD ≈ 6.99 ft
Finally, we can use the formula for the area of the triangle:
A = (1÷2)bh
A = (1÷2)(7.8 ft)(6.99 ft)
A ≈ 27.28
Therefore, Rounded to the nearest hundredth, the area of △ABC is 27.28.
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a 10 foot ladder is leaning against a wall. if the top of the ladder slides down the wall at a rate of 2 feet per second, how fast is the bottom of the ladder moving along the ground when the bottom of the ladder is 5 feet from the wall? write your answer in the most simplified form without rounding and do not include units.
The bottom of the ladder is moving at a rate of 4 feet per second when it is 5 feet from the wall.
Let's call the distance from the bottom of the ladder to the wall "x". We can use the Pythagorean theorem to relate the distances as follows:
x^2 + 10^2 = L^2
where L is the length of the ladder, which is constant at 10 feet. We can take the derivative of both sides with respect to time t:
2x (dx/dt) = 2L (dL/dt)
We want to find (dx/dt) when x = 5 and (dL/dt) = -2 (since the top of the ladder is sliding down the wall at a rate of 2 feet per second). Plugging these values in, we get:
2(5) (dx/dt) = 2(10) (-2)
Simplifying, we get:
10 (dx/dt) = -40
Dividing both sides by 10, we get:
dx/dt = -4
Therefore, the bottom of the ladder is moving along the ground at a rate of 4 feet per second in the opposite direction.
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pls help find the unknown angles
Answer:
x=34, z=26 degrees, y=74 degrees
Step-by-step explanation:
We can find x because the triangles are equal to each other, meaning that we can set 2x-20 equal to 4x-88. When solved, x=34. This now means that the expression 2x-20 and 4x-88 both equal to 48 degrees.
Now looking at the triangle on the left, we can find the angle using supplementary angles, setting 180-154, which is 26 degrees. This means z on the triangle to the right is also 26 degrees since the triangles are equal to each other.
Because of knowing two angles, we can now find the 3rd one by adding both of them up and subtracing it from 180. That will get you 106 degrees, then using vertical angles we can find that the angle measure of 106 degrees carries over to the second triangle.
To find y now, you simply subtract 106 from 180 to get 74 degrees.
(I believe this is right, hopefully it made sense!)
please help!!! trigonometry. WILL GIVE BRAINLY IF CORRECT
The correct trigonometric ratios for similar triangles are:
u (cos 34")/r (cos 34") = used to find u or r, given u or rt (sec 34")/q (sec 34") = used to find t or q, given t or qt (tan 34°)/q (tan 34") = used to find t or q, given t or qu (sin 34")/ r (sin 34") = used to find u or r, given u or rWhat are trigonometric ratios?Trigonometric ratios are mathematical functions that relate the angles and sides of a right triangle.
There are three main trigonometric ratios: sine, cosine, and tangent.
Sine (sin) is the ratio of the length of the side opposite an angle to the length of the hypotenuse of the triangle.
Cosine (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse of the triangle.
Tangent (tan) is the ratio of the length of the opposite side to the length of the adjacent side of the triangle.
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the diagram shows a triangular face of the pyramid of cestius in rome italy. the length of the base of the triangle is 30 meters. the lengths of the other two sides of the triangle are both 36 meters.
Answer: i will be able to help if i see the question??
Step-by-step explanation:
Question 2-1
Angle ABC is bisected by BD. If m/DBC = 36° and m/ABD = (4x-8), what is the value of x
The value of given equation is 11
What do you mean by Angle bisector ?An angle bisector is a line or ray that divides an angle into two congruent angles. In other words, it is a line or ray that cuts an angle into two equal parts. The point where the angle bisector meets the side of the angle is called the point of intersection.
In geometry, the angle bisector theorem states that if a line or ray bisects an angle of a triangle, then it divides the opposite side of the triangle into two segments that are proportional to the other two sides of the triangle. This theorem is often used to solve problems involving triangles and their side lengths.
Since BD is the angle bisector of angle ABC, we can use the angle bisector theorem to set up an equation involving the angles formed by BD and the sides of triangle ABC:
m/DBC : m/CBD = AB : AC
We know that m/DBC = 36°, so we can substitute that value into the equation:
36° : m/CBD = AB : AC
We also know that m/ABD = (4x-8), so we can substitute that value into the equation:
36° : (4x-8)° = AB : AC
To solve for x, we need to find the ratio AB : AC. Since we don't have any information about the lengths of the sides of triangle ABC, we can't find this ratio directly. However, we can use another property of angle bisectors: the angle bisector divides the opposite side of the triangle into two segments that are proportional to the other two sides.
In other words, we have:
BD/DC = AB/AC
We know that m/DBC = 36°, so we can use the fact that the angles in a triangle add up to 180° to find m/CBD:
m/CBD = 180° - m/ABC - m/DBC
m/CBD = 180° - 2m/DBC
m/CBD = 180° - 2(36°)
m/CBD = 108°
Now we can use the angle bisector theorem to write:
BD/DC = AB/AC
We know that BD = AB + AD and DC = AC + AD, so we can substitute these expressions into the equation:
(AB + AD)/AC + AD) = AB/AC
Simplifying this equation, we get:
AB/AC + AD/AC = AB/AC
Subtracting AB/AC from both sides, we get:
AD/AC = 0
Since the ratio of AD to AC is 0, we know that AD must be 0 (since we can't divide by 0). This means that D is actually on side BC, rather than on the extension of side BC. In other words, BD is actually the perpendicular bisector of side AC.
If BD is the perpendicular bisector of AC, then we know that AB = BC. Substituting this fact into our earlier equation, we get:
36° : (4x-8)° = 1 : 1
Simplifying this equation, we get:
36° = 4x-8
Adding 8 to both sides, we get:
44° = 4x
Dividing both sides by 4, we get:
11° = x
Therefore, the value of x is 11.
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What is the image point of (0, 1) after the transformation D5 o R270°?
A dramatic change in look or form is referred to as a transformation and the transformation of points (0, 1) to D5 o R270° is (270, -4).
What is transformation?A transformation is a significant alteration in appearance or form.
Your life may change as a result of a significant occasion like earning your driver's license, enrolling in college, or getting married.
A dramatic, drastic shift is called metamorphosis.
In the standard nomenclature, a function maps a number to a number, but a transform maps a function to a function.
This distinction is illogical and inaccurate.
So, fL2(R), to use an example, is a function (kind of), since f is sort of a numerical value for each xR. (x).
So, we have the points:
(0, 1)
Then, the transformation is D5 o R270°.
If D5 signifies "down 5" and R270," respectively.
then, subtract 5 from 1 and add 270 to get:
(270, -4)
Therefore, a dramatic change in look or form is referred to as a transformation and the transformation of points (0, 1) to D5 o R270° is (270, -4).
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The function f(x) = 1590.85)^x models the height, in feet, of a bouncing ball after x seconds.
What is the initial height of the bouncing ball?
What is the percent rate of change?
What is the height of the bouncing ball after 5 seconds? express your answers as a decimal rounded to the nearest hundredth.
In the function,
1) Initial height of the bouncing ball is 15feet.
2) The percent rate of change is -16.25%
3) The height of the bouncing ball after 5 seconds is 6.65 feet.
What is function?A mathematical phrase, rule, or law that establishes the link between an independent variable and a dependent variable (the dependent variable). In mathematics, functions exist everywhere, and they are crucial for constructing physical links in the sciences.
There seems to be a typo in the function you provided. I will assume that the function is:
=> f(x) = [tex]15(0.85)^x[/tex]
Assuming this is correct, here are the answers to your questions:
The initial height of the bouncing ball is the value of the function when
x = 0, which is:
=> [tex]f(0)=15(0.85)^0=15ft[/tex]
Therefore, the initial height of the bouncing ball is 15 feet.
The percent rate of change of the function can be found by taking the derivative of the function and expressing it as a percentage.
The derivative of the function is:
=> f'(x)= [tex]\frac{15ln(17)\times17^x-15ln(20)\times17^x}{20^x}[/tex]
The percent rate of change is then:
=> [tex]\frac{f'(x)}{f(x)} \times100\%[/tex]
=> [tex]\frac{\frac{15ln(17)\times17^x-15ln(20)\times17^x}{20^x}}{15(0.85)^x}[/tex]
=> [tex]ln(\frac{17}{20})[/tex]
=> -16.25%
Therefore, the percent rate of change of the function is approximately:
=> -16.25%
The height of the bouncing ball after 5 seconds is: then x=5
=> [tex]f(5)=15(0.85)^5[/tex]
Rounding this to the nearest hundredth, we get:
=> 6.65 feet
Therefore, the height of the bouncing ball after 5 seconds is approximately 6.65 ft.
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In 2012 there were approximately 97,507 electric vehicles sold in a particular country. In 2017, there were approximately 225,317 such vehicles sold. Answer parts a and b.
Question content area bottom
Part 1
a. Assume that the relationship between time, x, and number of electric-powered vehicles, y, is linear. Write an equation in slope-intercept form describing this relationship. Use ordered pairs of the form (years past 2012, number of vehicles).
The equation is enter your response here.
Answer: Using the two given points (0, 97507) and (5, 225317), we can find the slope:
slope = (225317 - 97507) / (5 - 0) = 25662
Then using the point-slope form of a line with the point (0, 97507):
y - 97507 = 25662x
Simplifying and putting in slope-intercept form:
y = 25662x + 97507
Therefore, the equation in slope-intercept form is y = 25662x + 97507.
Step-by-step explanation:
evaluate c(4,4)
-24
-1
-6
The combination expression c(4,4) when evaluated has a solution of 1
Evaluate the combination expressionThe expression c(4,4) represents the number of ways to choose 4 items from a set of 4 items, where the order in which we choose the items does not matter.
This is also known as a combination.
We can use the formula for combinations to calculate c(4,4):
c(4,4) = 4! / (4!(4-4)!)
= 4! / (4!0!)
= 4! / 4!
= (4 x 3 x 2 x 1) / (4 x 3 x 2 x 1)
= 1
Therefore, c(4,4) = 1.
There is only one way to choose 4 items from a set of 4 items, and that is to choose all 4 items.
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Which correctly describes how to determine the measure of angle 1?
2 parallel lines are crossed by a transversal to form 8 angles. Clockwise from top left, the angles are 105 degrees, blank, blank, blank; blank, blank, 2, 1.
The 105° angle and angle 2 are alternate exterior angles so angle 2 must measure 105°. Angles 1 and 2 are supplementary angles so angle 1 must measure 75°.
The 105° angle and angle 2 are corresponding angles so angle 2 must measure 105°. Angles 1 and 2 are supplementary angles so angle 1 must measure 75°.
The 105° angle and angle 2 are alternate exterior angles so angle 2 must measure 75°. Angles 1 and 2 are supplementary angles so angle 1 must measure 105°.
The 105° angle and angle 2 are corresponding angles so angle 2 must measure 75°. Angles 1 and 2 are supplementary angles so angle 1 must measure 105°.
The right option is: "Because angle 2 and angle 105 have equivalent angles, they must both be 75 degrees. As angles 1 and 2 are complementary, angle 1 must be 105°."
In geometry, a transversal is a line that crosses two or more parallel lines, whereas parallel lines are lines that never intersect. Eight angles are created when two parallel lines are crossed by a transversal; each pair of adjacent angle is congruent, as are alternate inner angles and alternate exterior angles.
We can infer from the facts provided that angle 2 and angle 105° are corresponding angles. A transversal that crosses two parallel lines and appears in the same relative position at each intersection creates corresponding angles. Angle 2 must be 75° if the 105° angle measures the same as the comparable angle.
We can use this knowledge to compute the measure of angle 1 since angles 1 and 2 are supplementary angles, which means they add up to 180°. Angle 1 must be 105° if angle 2 is 75° for the sum of the angles to reach 180°.
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Here is a pattern of squares. The equation represents the number of small squares in the pattern of n, the step number
n²+2 is the equation that represents this pattern.
What is General intelligence?
General intelligence in mathematics refers to the ability to reason logically, solve problems, and understand abstract concepts in the field of mathematics. It is often referred to as mathematical intelligence or mathematical aptitude.
People with strong mathematical intelligence have the ability to think logically, identify patterns and relationships, and apply mathematical concepts to solve complex problems. They can quickly grasp mathematical concepts and principles, and are able to use mathematical reasoning to analyze data, make predictions, and draw conclusions.
However, it's important to note that mathematical intelligence is just one aspect of intelligence, and does not necessarily predict success in other areas of life. It is possible for someone to excel in mathematics while struggling in other areas, or vice versa.
Moreover, the concept of general intelligence itself has been a subject of debate among psychologists, with some arguing that it is a single, overarching ability, while others argue that intelligence is made up of multiple, more specific abilities.
Here we have total four patterns.
First pattern has 3 square, second has 6 squares , third has 11 squares and 18 squares.
Our first option is 3n.
If we will put n = 1,2,3,4 then we will get 3,6,9,12 respectively.
Our second option is n²+2.
If we will put n = 1,2,3,4 then we will get 3,6,11,18 respectively.
Our third option is n²+4.
If we will put n = 1,2,3,4 then we will get 5,8,13,20 respectively.
And our fourth option is 4n+3
If we will put n = 1,2,3,4 then we will get 7,11,15,19 respectively.
Therefore, second option is the correct option.
So, n²+2 is the equation that represents this pattern.
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Anna has a number of tickets to sell for a play. On Monday she sells 35% of these tickets. On Tuesday she sells another 3/5 of these tickets. She then has 42 tickets left. How many did she sell on Monday?
Answer: Anna sold 56 tickets on Monday
Step-by-step explanation: Let’s call the number of tickets Anna has to sell “x”.
On Monday, Anna sells 35% of these tickets. That means she sells 0.35x tickets.
On Tuesday, she sells another 3/5 of the remaining tickets. That means she sells 0.6(0.65x) = 0.39x tickets.
After these two days of selling, Anna has 42 tickets left. So we can set up an equation:
x - 0.35x - 0.39x = 42
Simplifying this equation gives us:
0.26x = 42
Solving for x gives us:
x = 161.54
So Anna had 161 tickets to sell in total.
To find out how many tickets she sold on Monday, we can multiply the total number of tickets by the percentage she sold on Monday:
0.35 * 161 = 56.35
So Anna sold 56 tickets on Monday
Use the long division method to find the result when 4x³+7x²-8x-14 is divided by 4x+7. If there is a remainder, express the result in the form q(x)+r(x)/b(x).
Answer:
a
Step-by-step explanation:
First, we write the polynomial in descending order of degree:
4x³+7x²-8x-14
Now, we start dividing the first term of the dividend by the divisor:
x²
___________
4x+7|4x³+7x²-8x-14
We multiply x² by 4x+7 to get:
x²
___________
4x+7|4x³+7x²-8x-14
4x³+7x²
-8x
Now we bring down the next term:
x²-2
___________
4x+7|4x³+7x²-8x-14
4x³+7x²
-8x-14
+8x+14
_______
0
The remainder is zero, which means that 4x+7 is a factor of 4x³+7x²-8x-14. The quotient is x²-2.
Therefore, the result when 4x³+7x²-8x-14 is divided by 4x+7 is:
4x³+7x²-8x-14 = (4x+7)(x²-2) + 0
So, the quotient is x²-2, and there is no remainder.
I don't know how to do whatever this is
Answer: y values in order: 2, 1, 0.5
Step-by-step explanation:
Just take the x values and put them in place of the x in the above equation.
As for -1, you're flipping 0.5 over to a fraction of 1/0.5, which equals 2, so that's the first y value.
*This is because any negative exponent gets the number in the denominator with 1 in the numerator, then the denominator can change depending on the value of the exponent
For 0, anything to the power of 0 is 1, so that's the second y value.
And then for 1, the number doesn't change, so just put 0.5 in the third y-value.
Also I see it says for you to sketch a graph, in this case the picture I have showing is what the graph would look like
Hope this helps at least :)
given a minimized dfa with n states, what are the minimum and maximum number of states an equivalent nfa might have?
The minimum number of states an equivalent NFA might have is n, while the maximum number of states is 2^n. However, while an NFA with 2^n states is always possible, it may not be the most efficient representation of the language recognized by the DFA.
The minimum number of states an equivalent NFA might have is n. This is because every DFA can be viewed as a special case of NFA, where each state has only one outgoing transition for each possible input symbol.
Therefore, we can create an equivalent NFA by simply replacing each transition of the DFA with a set of transitions, where the set contains all possible transitions that could be taken in that state for a given input symbol. This NFA will have n states, one for each state of the original DFA.
On the other hand, the maximum number of states an equivalent NFA might have is 2^n. This is because each state of an NFA can have multiple outgoing transitions for the same input symbol, leading to multiple possible paths through the automaton for a given input string.
Therefore, we can create an NFA with 2^n states by creating an NFA that has one state for each subset of the states of the original DFA. Each state in the new NFA represents a set of states from the original DFA that could be reached by following any sequence of transitions for a given input string.
It is worth noting that while an NFA with [tex]2^n[/tex] states can always be constructed to be equivalent to a given minimized DFA, it may not be the most efficient representation of the language recognized by the DFA. In practice, there are often more efficient ways of constructing equivalent NFAs with fewer states.
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Three ballet dancers are positioned on stage. Max is 2 feet straight behind Kenji and 4 feet directly left of Lindsey. When the music begins, Max twirls to Lindsey's position, then leaps to Kenji's position, and finally walks back to his original position. How far did Max travel? If necessary, round to the nearest tenth.
The total distance Max traveled is 8.2 feet which is found by adding three distances together gives us the total distance Max traveled.
What is distance?Distance can be measured using other units such as time, speed, or even angles.
To calculate this, we need to find the distance between Max's original position and Lindsey's position, the distance between Lindsey's position and Kenji's position, and the distance between Kenji's position and Max's original position.
The distance between Max's original position and Lindsey's position=
4.0 feet.
This is because Max was 4 feet to the left of Lindsey.
The distance between Lindsey's position and Kenji's position= 2.8 feet. This is because Kenji was 2 feet behind Lindsey and Max was 4 feet left of Lindsey.
The distance between Kenji's position and Max's original position= 1.4 feet.
This is because Kenji was 2 feet behind Max.
Adding these three distances together gives us the total distance Max traveled: 4.0 feet + 2.8 feet + 1.4 feet = 8.2 feet.
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please help me I need this will mark brainliest
Since C=3x+4y and we want to maximize C, we need x and y to be as big as possible.
There are restrictions for x and y, namely that x ranges from 2 to 5 and y from 1 to 6. Subjected to these restrictions we set x to 5 and y to 6 because they are the max values for x and y.
Then C=3(5)+4(6)=39.
The base of an exponential function can only be a positive number.
A. True
B. Frise
Answer:
true
not good at explaining how
The base of an exponential function can only be a positive number is a true statement.
In Mathematics, the equation f(x) = [tex]a^{x}[/tex], in which the input variable x appears as an exponent, is described as an exponential function. Both the exponential function and the value of x are dependent on the exponential curve.
Here, “x” is a variable and “a” is a constant, also known as the base of the function. Depending on the exponential function, an exponential curve might increase or decrease. A quantity should have either exponential growth or exponential decay if it regularly increases or decreases by a predetermined percentage.
Therefore, the base of an exponential function can only be a positive number.
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One of the angles of a parallelogram is 36° greater than another one. Find the angles
of the parallelogram.
The angles are_,_,_,_
Answer:
Step-by-step explanation:
Opposite angles of a parallelogram are congruent.
Adjacent angles equal 180°.
If one angle is 36 ° more than the other than they are supplementary or equal to 180°.
x + x + 36 = 180
2x + 36 = 180
2x + 36 - 36 = 180 -36
2x = 144
2x/2 = 144/2
x = 72
2 angles = 72°
2 angles = 108°
All the angles = 360°.
72 × 2 = 144
108 x 2 = 216
144 + 216 = 360°
So this is correct.
suppose in an experiment, we randomly assign 15 participants to three treatment groups 1, 2, and 3 (with five participants per treatment). each of the three groups has received a different method of speed-reading instruction. a reading test is given and the number of words per minute is recorded for each participant. below is a table with the data collectedf) what is your conclusion about the population mean among the groups?
The null hypothesis for a one-way analysis of variance (ANOVA) is that there is no significant difference between the means of the groups, while the alternative hypothesis is that at least one group mean is significantly different from the others.
The null hypothesis (H0) for a one-way analysis of variance is that there is no significant difference in the mean of the dependent variable (number of words per minute) among the groups, and any observed differences are due to chance.
The alternative hypothesis (Ha) is that there is a significant difference in the mean of the dependent variable among the groups, and this difference is not due to chance. In other words, at least one of the groups has a different mean from the others.
Symbolically, the hypotheses can be expressed as:
H0: μ1 = μ2 = μ3 (where μ1, μ2, and μ3 are the population means for groups 1, 2, and 3, respectively)
Ha: At least one of the population means is different from the others.
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--The given question is incomplete, the complete question is given
" Suppose in an experiment, we randomly assign 15 participants to three treatment groups 1, 2, and 3 (with five participants per treatment). Each of the three groups has received a different method of speed-reading instruction. A reading test is given and the number of words per minute is recorded for each participant. Below is a table with the data collected:
Group 1 Group 2 Group 3
700 480 500
850 460 550
820 500 480
640 570 600
920 580 610
Write the null and alternative hypotheses for a one-way analysis of variance."--
help pls offering 95 points and if brainliest if 2 people answer
Answer:
126*2/(5+2+)
252/7=36
Step-by-step explanation:
Hope this helps! =D
Sorry again
the average spending at neco's salad bar is $9.41 with a standard deviation of $2.81. the distribution follows t-distribution. the management is interested in the middle 90% of the customers (spending wise) as it believes that they represent their true customer base. what will be the difference between the upper and lower spending cut-offs which define the middle 90% of the customers if the sample contains 41 customers?
The average spending difference between the upper and lower spending cut-offs which define the middle 90% of the customers is $1.94.
Average spending at Neco's salad bar is $9.41
Standard deviation of the spending is $2.81
Distribution follows t-distribution,
The management is interested in the middle 90% of the customers (spending wise)Sample contains 41 customers
In order to find the cut-off values, we need to find the z-values for 5% and 95% of the data set.
Lower cut-off = Average spending - z × (Standard deviation / √n)
Upper cut-off = Average spending + z × (Standard deviation / √n)
Here,
n = 41,
Average spending = $9.41,
Standard deviation = $2.81
Let's find the value of z from the t-distribution.
t-distribution is a symmetric distribution.
Since we need to find the middle 90%, we need to find the area outside of 5% (on both sides of the distribution).
For a 90% confidence interval, the area outside of 5% on both sides of the t-distribution is [tex]\frac{0.05}{2}[/tex] = 0.025.
As per the t-distribution table, for 40 degrees of freedom, the t-value for 0.025 is 2.021..
Lower cut-off = $9.41 - 2.021 × ()
Lower cut-off = $8.44
Upper cut-off = $9.41 + 2.021 × ($2.81/√41)
Upper cut-off = $10.38
Therefore, the difference between the upper and lower spending cut-offs which define the middle 90% of the customers is
$10.38 - $8.44 = $1.94.
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recall the use of data from the national health survey to estimate behaviors such as alcohol consumption, cigarette smoking, and hours of sleep for all u.s. adults. in the 2005-2007 report, they estimated that 30% of all current smokers started smoking before the age of 16. suppose that we randomly select 100 u.s. adults who are smokers and find that 25% of this sample started smoking before the age of 16 (an error of 5% compared to the 2005-2007 report). is this much error surprising? find the probability that a sample proportion will be an over- or underestimate of the parameter by more than 5%.
There is about a 10.4% probability that a sample proportion will be an over- or underestimate of the parameter by more than 5%.
The error of 5% is not surprising because it falls within the margin of error for a sample of 100 with a 95% confidence level. To find the probability that a sample proportion will be an over- or underestimate of the parameter by more than 5%, we need to use the formula for the margin of error:
Margin of error = zsqrt(p(1-p)/n)
where z is the z-score corresponding to the desired confidence level (1.96 for 95% confidence), p is the estimated proportion from the population (0.3 in this case), and n is the sample size (100 in this case). Plugging in the values, we get:
Margin of error = 1.96sqrt(0.30.7/100) = 0.088
So the margin of error is 8.8%. To find the probability of a sample proportion being an over- or underestimate by more than 5%, we need to find the area under the normal curve beyond 0.05 in either direction. This can be done using a standard normal table or calculator, and the probability is approximately 0.104.
Therefore, there is about a 10.4% chance that a sample proportion will be an over- or underestimate of the parameter by more than 5%.
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Lindsay is checking out books at the library, and she is primarily interested in mysteries and nonfiction. She has narrowed her selections down to eleven mysteries and six nonfiction books. If she randomly chooses three books from her selections, what's the probability that they will all be mysteries? Enter a fraction or round your answer to 4 decimal places, if necessary.
the probability that Lindsay will choose three mystery books is 0.1141 or 1141/10,000 as a fraction.
What's the probability that they will all be mysteries?Lindsay has 11 mystery books and 6 nonfiction books. The probability of Lindsay choosing one of her mystery books first is 11/17. Once she has chosen one mystery book, there are 10 remaining, so the probability of her choosing another one is 10/16.
Finally, there are 9 mystery books remaining when she chooses her third book, making the probability of her choosing one of her mystery books 9/15.
Thus, the probability that Lindsay chooses three mystery books is:P(mystery book 1 AND mystery book 2 AND mystery book 3)
= P(mystery book 1) * P(mystery book 2| mystery book 1) * P(mystery book 3| mystery book 1 and book 2)
P(mystery book 1) = 11/17P(mystery book 2| mystery book 1)
= 10/16P(mystery book 3| mystery book 1 and book 2)
= 9/15
Therefore, P(mystery book 1 AND mystery book 2 AND mystery book 3) = (11/17) * (10/16) * (9/15)
= 0.1141 (rounded to four decimal places)
Thus, the probability that Lindsay will choose three mystery books is 0.1141 or 1141/10,000 as a fraction.
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Pedro says that you can use the fact 18÷6=3
to find 180÷6
.
Use the drop-down menus and enter a value to complete his explanation below.
180÷6 = 30.
Pedro says that you can use the fact 18÷6=3
to find 180÷6
.
Use the drop-down menus and enter a value to complete his explanation below.
Sure, here's the completed explanation:
If we divide 180 by 18, we get 10.
So, we can divide 180÷6 by dividing 18÷6, which is 3.
A drop-down menu is a graphical user interface control that allows users to choose from a list of options presented in a pop-up menu. When the user clicks on the menu, it expands to display a list of available options. The user can then select an option by clicking on it, which updates the menu display to show the selected option and triggers an action associated with that option.
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the length of a rectangle is 3 yd less than double the width, and the area of the rectangle is 14 yd^2. find the dimensions of the rectangle.
Answer:
The rectangle is 3.5 yd x 4 yd
Step-by-step explanation:
Area = length x width = lw
l = length = 2w - 3
w = width
Area = 14(2w - 3)(w) = 14
2w² - 3w - 14 = 0
Use quadratic equation to find the 2 roots of w: a = 2, b = -3, c = -14
w = 3.5, -2 disregard the negative root
width = 3.5 yd
length = 2(3.5) - 3 = 4 yd
The dimensions of the rectangle are approximately 2.23 yards by 1.46 yards.
We are assuming the width of rectangle to be "x" yards. Then, the length would be (2x - 3) yards, since it is 3 yards less than double the width. The formula for the area of a rectangle is A = l x w, so we can plug in the values we know:
14 = (2x - 3) x x
Expanding the brackets:
14 = 2x² - 3x
Put this equation=0:
2x² - 3x - 14 = 0
Using the quadratic formula:
x = (3 ± √(3² + 4 x 2 x 14)) / (2 x 2)
x = (3 ± √97) / 4
We can ignore the negative root, since the width cannot be negative. Therefore,
x ≈ 2.23
This is the width of the rectangle. To find the length, we can plug this value back into the expression we derived earlier:
length = 2x - 3
length ≈ 1.46
Therefore, the dimensions of the rectangle are approximately 2.23 yards by 1.46 yards
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The diagram shows a scale drawing of a rectangular playground. The scale drawing is 1:500. Work out the premiere of the real playground. Give your answer in meters
The actual playground's perimeter is 1000 (x + y) meters, where x and y are the space's length and breadth.
What is perimeter of a rectangle?One of the key formulae for the rectangle could be regarded to be its perimeter. It is the entire length of the rectangle's outside perimeter.
The perimeter of a rectangle is defined as its length times its breadth.
Dimensions of a parallelogram = 2 × (length + width)
Given that, the scale drawing is 1:500
If the scale drawing playground has a length of x and a breadth of y, then the length and width of the playground, respectively,
are 500x and 500y.
The size drawing playground's perimeter = 2 × ( Length + width )
The size drawing playground's perimeter = 2 (x + y)
The actual playground's perimeter = 2 × ( Length + width )
The actual playground's perimeter = 2 × (500x + 500y)
= 2 × 500 (x + y)
The boundaries of the area itself = 1000 (x + y)
Therefore, the actual playground's perimeter is 1000 (x + y) meters, where x and y are the playground's length and breadth.
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The complete question is attached below,
walter bought a 21 pound bag of flour. he used 4.2 pounds of flour
Walter stored the remaining flour in 19 2 2/5-pound portions, with a small amount of flour left over.
we have:
(35/3) ÷ (12/5)
To divide by a fraction, we can multiply by its reciprocal:
(35/3) × (5/12)
Simplifying the fractions, we get:
(35/3) × (5/12) = (7/3) × (5/2) = 35/6
So, Walter stored the remaining flour in 35/6-pound portions. To express this in terms of 2 2/5-pound portions, we need to divide 35/6 by 2 2/5:
(35/6) ÷ (2 2/5)
Again, we convert 2 2/5 to an improper fraction:
2 × 5 + 2 = 12
So, we have:
(35/6) ÷ (12/5)
To divide by a fraction, we multiply by its reciprocal:
(35/6) × (5/12)
Simplifying the fractions, we get:
(35/6) × (5/12) = (35/72)
Therefore, Walter stored the remaining flour in 35/72 of a 2 2/5-pound portion.
To find the whole number of 2 2/5-pound portions, we need to divide 35/72 by 2 2/5. We can do this by dividing the numerator by the denominator and rounding down to the nearest whole number:
(35/72) ÷ (12/5) ≈ 0.818 ≈ 0
So, Walter stored the remaining flour in 0 whole 2 2/5-pound portions. However, he did store the remaining flour in 35/72 of a 2 2/5-pound portion, which is less than one portion. Therefore, we can say that he stored the remaining flour in 0.35 of a 2 2/5-pound portion, or approximately 0.35 × 2 2/5 = 0.875 pounds of flour per portion.
Finally, to find the number of 2 2/5-pound portions, we divide the total remaining flour by the amount in each portion:
16.8 ÷ 0.875 ≈ 19.2
So, Walter stored the remaining flour in 19 2 2/5-pound portions, with a small amount of flour left over.
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Gwen is making a circular garden that has a diamete of 10 feet. She is looking to buy fencing for the garden. How many feet if fencing will she need?
According the given statement Gwen will need apprοximately 31.4 feet οf fencing fοr her circular garden with a diameter οf 10 feet.
What is area οf a circle?The area οf a circle is: π ( Pi) times the Radius squared: A = π r2 οr, when yοu knοw the Diameter: A = (π/4) × D2 οr, when yοu knοw the Circumference: A = C2 / 4π
The circumference οf a circle is given by the fοrmula:
C = πd
where d is the diameter οf the circle.
In this case, the diameter οf the garden is 10 feet. Substituting intο the fοrmula, we get:
C = π(10) = 10π
Therefοre, the circumference οf the garden is 10π feet.
Since fencing is placed arοund the garden, Gwen will need tο buy enοugh fencing tο cοver the circumference οf the garden, which is 10π feet.
Apprοximating π as 3.14, we can find the apprοximate length οf fencing needed as:
10π ≈ 10 x 3.14 ≈ 31.4
Therefοre, Gwen will need apprοximately 31.4 feet οf fencing fοr her circular garden with a diameter οf 10 feet.
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