(c) Some of the students were asked how much time they spent revising for the test. 10 students revised for 2.5 hours, 12 students revised for 3 hours and students revised for 4 hours. The mean time that these students spent revising was 3.1 hours. Find n. Show all your working.​

The exact values of trigonometric functions are, respectively:

sin (u + v) = - 13 /85

tan (u + v) = - 13 / 84

In this problem we need to determine the exact values of trigonometric functions, this can be done by using trigonometric formulas and relationships between trigonometric functions. We need to use the following expressions:

sin² x + cos² x = 1

sin (u + v) = sin u · cos v + cos u · sin v

tan x = sin x / cos x

tan (u + v) = (tan u + tan v) / (1 - tan u · tan v)

Where x, u, v are measured in radians.

Now we proceed to determine the exact values of each function:

cos u = √[1 - (- 3 / 5)²]

cos u = 4 / 5

sin v = √[1 - (15 / 17)²]

sin v = 8 / 17

sin (u + v) = (- 3 / 5) · (15 / 17) + (4 / 5) · (8 / 17)

sin (u + v) = - 13 /85

tan u = (- 3 / 5) / (4 / 5)

tan u = - 3 / 4

tan v = (8 / 17) / (15 / 17)

tan v = 8 / 15

tan (u + v) = (- 3 / 4 + 8 / 15) / [1 - (- 3 / 4) · (8 / 15)]

tan (u + v) = - 13 / 84

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a. The revenue function R(x) = 75x - 3x² graph plotted below.

b. Value of x is 12.5 and maximum revenue produces $468.75

c. Wholesale price/chip that produces the maximum revenue is $37.50

A company's or business's revenue is the total amount of money it receives from sales of its products or services over a given time period.

a) To sketch a graph of the revenue function R(x), we first need to calculate R(x) using the given formula:

⇒ R(x) = x P(x)

⇒ R(x) = x(75 - 3x)

⇒ R(x) = 75x - 3x²

Now we can plot this function on a rectangular coordinate system. Below is an sketch of the graph.

b) Taking the derivative of R(x) and setting it equal to 0:

⇒ R'(x) = 75 - 6x = 0

⇒ 6x = 75

⇒  x = 12.5

So, x = 12.5 is the value of x that will produce the maximum revenue. To find the maximum revenue, we can substitute x = 12.5 into the revenue function R(x) = x (75 - 3x)

⇒ R(12.5) = 12.5 (75 - 3 (12.5)) = 468.75

⇒ R(12.5) = $ 468.75

Therefore, the maximum revenue is $468.75

c) To find the wholesale price per chip that produces the maximum revenue, we can substitute x = 12.5 into the price function, P(x) = 75 - 3x​

⇒ P(12.5) = 75 - 3(12.5)

⇒ P(12.5) =  $37.50 per chip

Therefore, the wholesale price per chip that produces the maximum revenue is $37.50.

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Answer: The perimeter of a rectangle is found by adding up all four sides. For this rectangle with a base of 9 ft and a height of 10 ft, the two base sides have a length of 9 ft each, and the two height sides have a length of 10 ft each. Therefore, the perimeter is:

P = 2(9 ft) + 2(10 ft) = 18 ft + 20 ft = 38 ft

So the perimeter of the rectangle is 38 feet.

Step-by-step explanation:

Answer:

Step-by-step explanation:

23 people ordered dessert.

8 of these ordered only a dessert.

P(not starter | ordered dessert) [tex]=\frac{8}{23}[/tex]

The new average handling time for Agent D would be 90% of their original handling time.

A percentage is a way of expressing a number as a fraction of 100. It is typically represented using the percent sign (%) and is often used to describe the amount or proportion of something in relation to a whole. Percentages are commonly used in a variety of fields, such as finance, mathematics, and statistics.

Let's say the original average handling time for Agent D was "x" units (e.g. seconds, minutes, etc.). If Agent D was able to reduce their average handling time by 10%, their new average handling time would be:

New average handling time = x - 0.1x

Simplifying the expression on the right-hand side:

New average handling time = 0.9x

Therefore, the new average handling time for Agent D would be 90% of their original handling time.

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After answering the presented question, we can conclude that the probability of 30 or more seconds between vehicle arrivals is approximately 0.082.

Probability is a measure of how likely an event is to occur. It is represented by a number between 0 and 1, with 0 representing a rare event and 1 representing an inescapable event. Switching a fair coin and coin flips has a chance of 0.5 or 50% because there are two equally likely outcomes. (Heads or tails). Probabilistic theory is an area of mathematics that studies random events rather than their attributes. It is applied in many fields, including statistics, economics, science, and engineering.

exponential probability distribution

[tex]P(X ≤ 12) = ∫[0,12] f(x) dx = ∫[0,12] (1/12) * e^(-x/12) d\\P(X ≤ 12) = [-e^(-x/12)] [0,12] = -e^(-1) + 1 ≈ 0.632\\P(X ≤ 6) = ∫[0,6] f(x) dx = ∫[0,6] (1/12) * e^(-x/12) dx\\P(X ≤ 6) = [-e^(-x/12)] [0,6] = -e^(-1/2) + 1 ≈ 0.393\\[/tex]

Therefore, the probability that the arrival time between vehicles is 6 seconds or less is approximately 0.393.

P(X ≥ 30) = 1 - P(X < 30) = 1 - P(X ≤ 30) = 1 - ∫[0,30] f(x) dx

[tex]= 1 - ∫[0,30] (1/12) * e^(-x/12) dx[/tex]

[tex]P(X ≥ 30) = 1 - [-e^(-x/12)] [0,30] = e^(-2.5) ≈ 0.082[/tex]

Therefore, the probability of 30 or more seconds between vehicle arrivals is approximately 0.082.

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Answer:

x = 2;

y = √3

Step-by-step explanation:

Use trigonometry:

[tex] \tan(60°) = \frac{y}{1} [/tex]

Cross-multiply to find y:

[tex]y = 1 \times \tan(60°) = 1 \times \sqrt{3} = \sqrt{3} [/tex]

Use the Pythagorean theorem to find x:

[tex] {x}^{2} = {y}^{2} + {1}^{2} [/tex]

[tex] {x}^{2} = ( { \sqrt{3}) }^{2} + {1}^{2} = 3 + 1 = 4[/tex]

[tex]x > 0[/tex]

[tex]x = \sqrt{4} = 2[/tex]

1850 students are expected to buy lunch one or two days a week next year.

A ratio or figure stated as a fraction of 100 is called a percentage. The sign "%" is frequently used to indicate it as a percentage or a component of a total.

If 63% of the students do not typically buy a school lunch, then 37% of the students do typically buy a school lunch.

Let's assume that x students plan to buy lunch one or two days a week.

Then, the number of students who do typically buy a school lunch can be estimated as:

0.37(5000) = 1850

Let's assume that p% of the students plan to buy lunch one or two days a week. Then, we can set up the following equation:

p% of (5000) = x

To solve for x, we need to convert the percentage to a decimal by dividing by 100:

p/100 × 5000 = x

Simplifying the equation, we get:

50p = x

We can substitute this equation into the original equation to get:

0.37(5000) = 50p

Simplifying and solving for p, we get:

1850 = 50p

p = 37

Therefore, approximately 37% of the 5000 middle school students, or 1850 students, are expected to buy lunch one or two days a week next year.

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The correct option is $58,527.87

Using the loan details and bonus payment provided, the remaining balance on the loan at the end of 10 years and a month can be calculated as follows:

Number of payments made = 10 years * 12 months/year + 1 month = 121

Monthly interest rate = 4.75% / 12 = 0.3958%

Yearly bonus payment = $4,500

Using the PMT function in Excel, the monthly payment on the loan can be calculated as:

PMT(0.003958, 15*12, 320000) = -$2,378.03

Since the bonus payment is made once a year, it can be applied as a lump sum to the remaining balance at the end of each year. Therefore, the remaining balance after 10 years and a month can be calculated as:

Remaining balance = PV(0.003958, 5*12, -2378.03, 0, 0) - 4500

where PV is the present value function.

Solving this equation yields:

Remaining balance = $58,527.87

Therefore, the answer is $58,527.87.

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Answer:

To determine the area of the garden that needs to be covered with plastic, we need to multiply the length by the width of the garden. However, we need to convert the measurements to the same unit of measurement. Let's convert the measurements into yards since we need to find the area in square yards. 12 ft = 4 yards 15 ft = 5 yards 9 ft = 3 yards Now, we can calculate the area: Area = Length x Width Area = 5 yards x 4 yards Area = 20 square yards Therefore, Robert needs 20 square yards of plastic to cover his garden.

Answer:

Step-by-step explanation:

Since A and B are independent events, we can use the formula:

P(A ∩ B) = P(A) x P(B)

P(A ∩ B) = 0.10 x 0.60

P(A ∩ B) = 0.06

So the probability of both events A and B occurring is 0.06.

To find P(A U B), we can use the formula:

P(A U B) = P(A) + P(B) - P(A ∩ B)

P(A U B) = 0.10 + 0.60 - 0.06

P(A U B) = 0.64

Therefore, the probability of either A or B occurring (or both) is 0.64.

On solving the provided question we can say that As a result, the triangle is resolved.

The study of the relationship between triangle side lengths and angles is known as trigonometry. The concept first originated in the Hellenistic era, during the third century BC, due to the application of geometry in astronomical investigations. The subject of mathematics known as exact techniques deals with certain trigonometric functions and their potential applications in computations. There are six commonly used trigonometric functions in trigonometry. Sine, cosine, tangent, cotangent, secant, and cosecant are their separate names and acronyms (csc). The study of triangle properties, particularly those of right triangles, is known as trigonometry. As a result, geometry is the study of the properties of all geometric shapes.

We now have all of the information we require to solve the triangle. We now have:

a = 55.815 sin(A) (A

b = 55.815 sin(B) (B)

c = 32

A + B + C = 180°

B = 153° - A

To find the values of A and B, we can use a calculator. We get:

A ≈ 83.814°

B ≈ 42.186°

32 / sin(27°) = a / sin(A)

a ≈ 54.482

AB ≈ 54.482

BC ≈ 39.343

AC ≈ 22.414

A ≈ 83.814°

B ≈ 42.186°

C ≈ 27°

As a result, the triangle is resolved.

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Answer:

[tex]\tan \left(\dfrac{x}{2}\right)=3[/tex]

Step-by-step explanation:

Trigonometric ratios are the ratios of the sides of a right triangle.

[tex]\boxed{\begin{minipage}{9.4 cm}\underline{Trigonometric ratios} \\\\$\sf \sin(\theta)=\dfrac{O}{H}\quad\cos(\theta)=\dfrac{A}{H}\quad\tan(\theta)=\dfrac{O}{A}$\\\\where:\\ \phantom{ww}$\bullet$ $\theta$ is the angle. \\ \phantom{ww}$\bullet$ $\sf O$ is the side opposite the angle. \\\phantom{ww}$\bullet$ $\sf A$ is the side adjacent the angle. \\\phantom{ww}$\bullet$ $\sf H$ is the hypotenuse (the side opposite the right angle). \\\end{minipage}}[/tex]

The sine trigonometric ratio is the ratio of the side opposite the angle to the hypotenuse.

Given sin(x) = 3/5, the side opposite angle x is 3, and the hypotenuse is 5.

As we have two sides of the right triangle, we can calculate the third side (the side adjacent the angle) using Pythagoras Theorem.

[tex]\boxed{\begin{minipage}{9 cm}\underline{Pythagoras Theorem} \\\\$a^2+b^2=c^2$\\\\where:\\ \phantom{ww}$\bullet$ $a$ and $b$ are the legs of the right triangle. \\ \phantom{ww}$\bullet$ $c$ is the hypotenuse (longest side) of the right triangle.\\\end{minipage}}[/tex]

Therefore:

[tex]\implies A^2+3^2=5^2[/tex]

[tex]\implies A^2+9=25[/tex]

[tex]\implies A^2+9-9=25-9[/tex]

[tex]\implies A^2=16[/tex]

[tex]\implies \sqrt{A^2}=\sqrt{16}[/tex]

[tex]\implies A=4[/tex]

Use the cosine trigonometric ratio to find the value of cos(x), remembering that cosine is negative in Quadrant II.

[tex]\implies \cos x=-\dfrac{4}{5}[/tex]

Now we have the values of sin(x) and cos(x) in Quadrant II, we can use the tangent half angle formula to find the value of tan(x/2).

[tex]\begin{aligned}\implies \tan \left(\dfrac{x}{2}\right)&=\dfrac{\sin x}{1+\cos x}\\\\&=\dfrac{\frac{3}{5}}{1-\frac{4}{5}}\\\\&=\dfrac{\frac{3}{5}}{\frac{1}{5}}\\\\&=\dfrac{3}{5} \cdot \frac{5}{1}\\\\&=3\end{aligned}[/tex]

Therefore, the value of tan(x/2) is 3.

Answer: The height above the ground in feet of a football thrown into the air from the balcony of a house is given by the expression:

h(t) = -12t^2 + 20t + 30

where t is the time in seconds since the ball was thrown.

To find the height of the balcony above the ground, we need to determine the initial height of the football when it was thrown from the balcony. This initial height corresponds to the value of h(0), since the time elapsed since the throw was zero at that moment.

Therefore, we can substitute t = 0 into the expression for h(t):

h(0) = -12(0)^2 + 20(0) + 30 = 30

This means that the balcony is 30 feet above the ground.

Hence, the height of the balcony above the ground is 30 feet.

Step-by-step explanation:

If one number is increased by a factor of 12 and the other is decreased by a factor of 4, the product of the two numbers will be multiplied by a factor of 3.

Let's suppose we have two numbers, A and B, and we want to know how their product will change if one number is increased by a factor of 12 and the other is decreased by a factor of 4.

The initial product of the two numbers is:

A x B

If we increase A by a factor of 12, the new value of A will be 12A. If we decrease B by a factor of 4, the new value of B will be B/4. Therefore, the new product of the two numbers will be:

(12A) x (B/4) = (12/4) x A x B = 3AB

So the new product of the two numbers will be three times the initial product. In other words, if one number is increased by a factor of 12 and the other is decreased by a factor of 4, the product of the two numbers will increase by a factor of 3.

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Using dilation, we can find the coordinates of the new trapezoid and the coordinates of T" is (-6, -4).

Dilation is the process of increasing an object's size without altering its shape. Depending on the scale-factor, the object's size may increase or shrink. A square of side 5 units can be widened to a square of side 15 units using dilation maths, but the square's shape doesn't change.

In geometry, dilation math is used to enlarge and reduce two- or three-dimensional figures.

Here in the question,

The coordinates of point T = (-3, -2)

Now, the trapezoid is dilated about the origin.

The scale factor here is. k = 2.

The new coordinates of the point T":

x coordinate = -3 × 2 = -6

y coordinate= -2 × 2 = -4

The coordinates of T" = (-6, -4).

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Answer:

False

Step-by-step explanation:

Purple: 13÷8= 1.625

Teal: 15÷6= 2.5

The ratios don't have the same scale factor. Therefore they are not equivalent fractions.

the frequency of the sinusoidal graph is 1/π.

Answer:

It took Adele's brother 37.45 + 2.10 = 39.55 seconds to run the race.

Answer:

Food is brought for us by them.

Answer:

Food is brought for us by them.

Step-by-step explanation:

[ 25 , 1.581 ] is the pair that is the mean and standard error of x.

What does standard error mean?

A statistical concept known as the standard error uses standard deviation to assess how well a sample distribution represents a population.

                            The standard error of the mean describes the statistical variation between a sample mean and the population's actual mean. Measures of variability include standard error and standard deviation: The standard deviation describes variation within a single sample.

 n = 80

 μ = 25

 σ² = 200

mean of x =  μ  = 25

 standard error = √ σ²/n

                        = √200/80

                         = 1.581

                         = [ 25 , 1.581 ]

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Answer: Jake solved it incorrectly.

Step-by-step explanation: His equation was supposed to be (7/2*35/2) *18

Answer: C (23)

Step-by-step explanation:

Since the triangle is isosceles, BA = BC

x + 17 = 2x -6

x = 23

Answer:

C(23)

Step-by-step explanation:

Since line AB = line BC

x+17=2x-6, by collecting like terms x=23

sin 45° = opposite/hypotenuse = x/√2x = √2/2. The answer is B. √2/2.

What is trigonometry?

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles. It focuses on the study of trigonometric functions, which are functions that relate the angles of a triangle to the ratios of the lengths of its sides.

The triangle shown in the diagram is a right triangle with one angle of 45 degrees, which means that the other two angles must measure 45 degrees each as well.

The sine of an angle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse. In this case, we can label the sides of the triangle as follows:

The side opposite the 45-degree angle is x.

The side adjacent to the 45-degree angle (and opposite the other 45-degree angle) is also x.

The hypotenuse is the longest side of the triangle and is labeled as √2x.

Using the definition of sine, we have:

sin 45° = opposite/hypotenuse = x/√2x = √2/2

Therefore, the answer is B. √2/2.

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Answer: (7.2, -3.2)

Step-by-step explanation:

         First, we will graph these equations. See attached. One has a y-intercept of -5 and then moves four units right for every unit up (we get this from the slope of 1/4). The other has a y-intercept of 4, and moves right one unit for every unit down (we get this from the slope of -1).

         The point of intersection is the solution, this is the point at which both graphed lines cross each other. Our solution is:

                         (7.2, -3.2)     x = 7.2, y = -3.2

Answer:

x = 25

Step-by-step explanation:

By the angle sum property,

2x + 2 + 5x + 3 = 180

7x + 5 = 180

7x = 175

x = 25

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Answer:

x = 25

Step-by-step explanation:

2x + 2 + 5x + 3 = 180

7x + 5 = 180 and 7x=175

7x = 175

x = 25

so x is most  likely the answer

x=25 Give her BRAINLEST for figuring it out first

For the four transformations based on f(x)= [tex]2^{x}[/tex],

1)6f(x)= 6 [tex]2^{x}[/tex]

2)f(6x)= [tex]2^{6x}[/tex]

3)f(x+6)=[tex]2^{x+6}[/tex]

4)f(x)+6 =  [tex]2^{x}[/tex]+6

What are transformations?

Transformations in any given function is changing its original form to nre form by flipping, rotating, shifting, enlarging and compressing the function. We can move the given function up or down as per the given conditions by adding up or subtracting the constant in y axis. We can move the given function left or right as per the given conditions by adding up or subtracting the constant in x axis. We can stretch or compress the function about x or y axes. Also we can also flip,reverse the function, reflect about axes or enlarge the functions.

Here given that function f(x)= [tex]2^{x}[/tex]

From the given graph we can identify few points for the given function:

(-1,0.5); (0,1); (1,2); (2,4); (3,8); (4,16); (5,32); (6,64) and so on.

Now to identify the transformations, we can substitute the tranformed value of x in the function:

1)6 f(x) = 6 .  [tex]2^{x}[/tex] {as we know that f(x)= [tex]2^{x}[/tex]}

∴6 f(x) will be equal to 6 .  [tex]2^{x}[/tex]

2)f(6x) : for this we can replace 'x' by '6x'

f(6x) =  [tex]2^{6x}[/tex]

3)f(x+6): for this function replace 'x' by 'x+6'

f(x+6)=[tex]2^{x+6}[/tex]

4)f(x)+6 : substitute f(x)= [tex]2^{x}[/tex], we get

f(x)+6 =  [tex]2^{x}[/tex]+6

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a)The range of 95% of the data is from 21 mpg to 26 mpg, which is a range of 5 mpg.

b)We need a sample size of 543 to estimate the mean with 98% confidence and an error of 0.25 mpg

What is Empirical Rule for a normal distribution?

If a dataset is normally distributed, we can expect that about 68% of the data points will fall within one standard deviation of the mean, about 95% of the data points will fall within two standard deviations of the mean, and about 99.7% of the data points will fall within three standard deviations of the mean. This rule is a useful guideline for understanding the spread of data in a normal distribution.

(a) Using Method 3 (the Empirical Rule for a normal distribution), we know that for a normally distributed random variable, approximately 68% of the data falls within one standard deviation of the mean, 95% of the data falls within two standard deviations of the mean, and 99.7% of the data falls within three standard deviations of the mean.

Since the range of the combined city/highway fuel economy of a 2016 Toyota 4Runner 2WD 6-cylinder 4-L automatic 5-speed using regular gas is from 21 mpg to 26 mpg, the midpoint of the range is (21 + 26) / 2 = 23.5 mpg.

Using the Empirical rule, we know that approximately 95% of the data falls within two standard deviations of the mean. Therefore, the range of 95% of the data is from 21 mpg to 26 mpg, which is a range of 5 mpg.

We can set up the following equation to solve for the standard deviation, σ:

2σ = 5

σ = 5 / 2

σ = 2.5

Therefore, the estimated standard deviation is 2.5 mpg. Rounded to 4 decimal places, the estimated standard deviation is 2.5000 mpg.

(b) The formula for the margin of error is:

Margin of error = z-value×(standard deviation / √(sample size))

We want the margin of error to be 0.25 mpg and the confidence level to be 98%. Since we are using a z-value, we can look up the z-value for a 98% confidence level in a standard normal distribution table.

The z-value for a 98% confidence level is approximately 2.33 when rounded to 3 decimal places.

Plugging in the given values, we have:

0.25 = 2.33×(2.5 / √(sample size))

Solving for the sample size, we get:

√(sample size) = 2.33 × (2.5 / 0.25)

√(sample size) = 23.3

sample size = (23.3)²

sample size = 542.89

Rounded to the nearest whole number, we need a sample size of 543 to estimate the mean with 98% confidence and an error of 0.25 mpg.

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The Griffins ended up paying a total of $575,647.60 for the house. The Griffins paid a total of $331,647.60 in interest over the 30-year period

Interest rate refers to the percentage of the principal amount charged by a lender to a borrower for the use of money over a certain period of time.

(a) The total amount they ended up paying for the house can be calculated by adding the down payment to the total amount paid in monthly mortgage payments over the 30-year period:

Total amount paid = down payment + (monthly payment x number of payments)

Number of payments = 30 years x 12 months/year

                                    = 360

Total amount paid = $48,000 + ($1462.91 x 360)

                               = $48,000 + $527,647.60

                               = $575,647.60

Therefore, the Griffins ended up paying a total of $575,647.60 for the house.

(b) The total amount of interest paid on the mortgage can be calculated by subtracting the amount borrowed (i.e., the purchase price minus the down payment) from the total amount paid over the 30-year period:

Total interest paid = total amount paid - amount borrowed

Amount borrowed = $292,000 - $48,000 = $244,000

Total interest paid = $575,647.60 - $244,000 = $331,647.60

Therefore, the Griffins paid a total of $331,647.60 in interest over the 30-year period.

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