will mark brainliest!!!!

Find the value of each variable.
x =
y =
(look at picture)

The modal class of time spent exercising from the table that shows the time spent exercising, is 40 < x ≤ 50.

The class that the median lies is 30 < x ≤ 40.

The modal class would be the one that has the highest frequency which is the class that has the most time spent exercising. That class is the 40 < x ≤ 50 class with 21 people.

The class in which the median lies is the middle class and we need to find the total first:

= 18 + 14 + 3 + 16 + 21 + 7

= 79 people

The median frequency is therefore:

= ( 79 + 1 ) / 2

= 40 th position

This is located in the 30 < x ≤ 40 class.

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Answer:

1.83 yards

Step-by-step explanation:

Answer:

the value of (7x)° is one because any thing power 0 is one

Answer:

B) −7xy+2y

E) 3x−2+6x^2

The total work done by the worker is approximately 4346.32 J, and the power developed by the worker is approximately 24.14 W.

To calculate the total work done by the worker, we need to consider both the horizontal pushing work and the vertical lifting work.

Horizontal pushing work:

Work (W) = Force (F) × Distance (d) × cos(θ)

where θ is the angle between the force and the displacement.

Since the force is applied horizontally and the displacement is also horizontal, the angle between them is 0 degrees, and cos(0) = 1.

Vertical lifting work:

To calculate the work done in lifting the load vertically, we first need to find the force required to lift the load. The force required to lift the load is equal to the weight of the load:

Weight (Wt) = Mass (m) × Acceleration due to gravity (g)

where g ≈ 9.81 m/s² (approximately, on Earth's surface).

Wt = 60 kg × 9.81 m/s²

Wt ≈ 588.6 N

Now, we can calculate the work done in lifting the load:

W_vertical = Wt × h × cos(0)

where h is the vertical height.

W_vertical = 588.6 N × 1.2 m × 1

W_vertical ≈ 706.32 J

Now, we can find the total work done:

Next, we'll calculate the power developed by the worker. Power is the rate of doing work, and it can be calculated as:

Power (P) = Work (W) / Time (t)

The worker does the work in 3 minutes, so we need to convert this time to seconds:

t = 3 min × 60 s/min = 180 s

Now, we can calculate the power:

P = W_total / t

P ≈ 4346.32 J / 180 s

P ≈ 24.14 W (watts)

So, the total work done by the worker is approximately 4346.32 J, and the power developed by the worker is approximately 24.14 W.

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The question in English is:

A construction worker pushes a 60-kg load across the floor a distance of 14 m by applying a force of 260 N, then lifts the load vertically to a platform that is 1.2 m above the floor. I do this work in a total of 3 minutes. What is the total work and power developed by the worker?

To express the ans in scientific notation is 1.98 x [tex]10^{10}[/tex] text messages per month.

You must add up all of the numbers in a set and divide the result by the total amount of numbers in order to determine the average of the set of numbers. The mean is another name for this.

The steps to calculating the average are as follows:

Sum up each of the set's numbers.

Count how many numbers there are in all.

subtract the total number of numbers from the sum of the numbers.

The average (mean) is calculated using the following formula:

Average equals ((Sum of Numbers)/ (Total Number of Numbers)

To calculate the total number of text messages sent by all teenagers in the United States in a month, we can multiply the number of teenagers by the average number of text messages sent by each teenager:

Total text messages = (number of teenagers) x (average number of text messages per teenager)

Total text messages = 22,000,000 x 900

Multiplying these numbers gives us:

Total text messages = √19,800,000,000

Total text messages = 140712.473 text messages per month.

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Joe will reach the dam on June 6, which is 5 days after he starts his journey on June 1.

What is distance?

Distance is the measure of how far apart two objects or locations are from each other.

Let's first calculate the net distance Joe travels each day:

Net distance = Distance paddled upstream - Distance pushed downstream by the current

Net distance = 5 miles - 3 miles

Net distance = 2 miles

This means that Joe moves 2 miles closer to the dam each day.

To reach the dam, Joe needs to cover a distance of 10 miles upstream from his starting point. Since he covers 2 miles per day, he will take:

Days taken to reach the dam = Distance to cover ÷ Distance covered each day

Days taken to reach the dam = 10 miles ÷ 2 miles per day

Days taken to reach the dam = 5 days

Therefore, Joe will reach the dam on June 6, which is 5 days after he starts his journey on June 1.

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Answer:

42

Step-by-step explanation:

evaluate each expressions when a=2and b=6. 7a-ab+b

As Ron said he would spend $400 of his paycheck on these items, it is not reasonable because the total cost of the items is $450, which is $50 more than the amount he planned to spend. So, option A is correct.

As per given information,

Ron want to spend $400.

Ron wants to buy nine items that each cost $50.
To find the total cost of these items, we need to multiply the number of items by the cost of each item .
So,

Total cost of items = 9 x 50  

Total cost of items = 450
This results in a total cost of $450.

This is not reasonable because nine items at $50 each would cost $450

Therefore, option A is correct.

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The equation of equation according to the given unknown is [tex]y=-3x-\frac{2}{5}[/tex]

The edges that connect the graph's vertices (also known as nodes) are its vertices (lines). The use of the linear graph extends beyond mathematics into a variety of disciplines, including computer science, linguistics, biology, physics, and chemistry. The best example of a graph structure in real life is GPS, which allows you to follow a route or determine a road's direction.

The y-intercept is the point at which the graph crosses the y-axis. The most important step in graphing any function with the formula y = f(x) is finding the intercepts. For a function, an intercept can take one of two forms. What they are is what the x-intercept and y-intercept are. A function's "intercept" is the location where the axis is cut by the function's graph.

we have the equation y=mx+b

m is the slope and b is the y-intercept

[tex]y=-3x-\frac{2}{5}[/tex]

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The correct answer is f(5) - f(2).

The probability of having more than 2 but less than 5 accidents can be calculated by subtracting the cumulative probability of having 2 or fewer accidents (represented by f(2)) from the cumulative probability of having 5 or fewer accidents (represented by f(5)).

We can calculate the probability of having exactly 3 accidents (represented by f(3)), the probability of having exactly 4 accidents (represented by f(4)), and then sum them up. Another valid answer is f(3) + f(4) - f(2).

Both approaches should yield the same result since they represent the same probability of having more than 2 but less than 5 accidents. It's important to note that the probability mass function (f(x)) represents the probability of a specific value of x occurring.

While the cumulative distribution function (F(x)) represents the probability of x being less than or equal to a specific value.

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The best measure of center for this data would be the median, as it is less affected by outliers and works well for skewed data. To find the median, we arrange the data in order: 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5. There are 16 data points, so the median would be the average of the 8th and 9th values, which is 3.5. Therefore, the best measure of center for this data is the median, and its value is 3.5.

So the correct answer is: The median is the best measure of center, and it equals 3.5.

The answer to the questions are as follows - a) Yes this situation represents a Markov chain. b)The matrix and diagram are shown below. c)There are two classes.d) the probabilities of the Markov chain being in the states "Green", "Yellow", and "Red" after three more lights are approximately 0.37, 0.33, and 0.3, respectively. e)The proportion of green lights is approximately 0.43, the proportion of yellow lights is approximately 0.19, and the proportion of red lights is approximately 0.29.

(a) Yes, this situation represents a Markov chain since it has the property of memorylessness, meaning that the probability of moving to a certain state in the future depends only on the current state and not on the past.

(b) The transition probability matrix for the Markov chain can be set up as follows:

P =

| 0.4 0.3 0.3 |

| 0.5 0.2 0.3 |

| 0.2 0.5 0.3 |

where the rows and columns correspond to the states "Green", "Yellow", and "Red", respectively, the diagram of the Markov chain is shown below:

       (0.4)        (0.3)        (0.3)

  Green -----> Yellow -----> Red

  <----- (0.5)   <----- (0.2)   <----- (0.3)

       (0.1)        (0.3)        (0.4)

(c) There are two classes in the Markov chain: {Green, Yellow} and {Red}. The first class is recurrent, while the second class is transient.

(d) The probability vector after three more lights can be computed by multiplying the initial probability vector [1 0 0] (since the first light is green) by the transition probability matrix three times. That is, we need to compute:

[1 0 0] * P * P * P

= [0.37 0.33 0.3]

Therefore, the probabilities of the Markov chain being in the states "Green", "Yellow", and "Red" after three more lights are approximately 0.37, 0.33, and 0.3, respectively.

(e) Let g, y, and r denote the proportions of green, yellow, and red lights. Then we have the following system of equations based on the transition probability matrix:

0.4g + 0.5y + 0.2r = g

0.3g + 0.2y + 0.5r = y

0.3g + 0.3y + 0.3r = r

Simplifying each equation, we get;

0.3g - 0.5y + 0.2r = 0

0.3g + 0.3y - 0.5r = 0

-0.3g + 0.2y + 0.3r = 0

Solving this system of equations using Gaussian elimination, we get:

g = (3/7)

y = (4/21)

r = (9/35)

Therefore, the proportion of green lights is approximately 0.43, the proportion of yellow lights is approximately 0.19, and the proportion of red lights is approximately 0.29.

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The complete question is given below-

There are three possible states for a traffic light: Green (G), Yellow (Y), and Red (R) and they simultaneously give the signal. a)Does this situation represent a Markov chain? explain. (b) set up the transition probability matrix and diagram. (c) determine the number of classes and classify them. (d) the first light is green. compute and interpret all probabilities after three more lights. (e) if kymere has many street lights between the home and the university, what proportion of these lights are green, yellow, and red? [no technology estimations permitted. solve this problem with a system of equations showing every step and fraction answers only.]

The true statement regarding Pearson's correlation coefficient is that it can be used as an effect size measure.What is Pearson's correlation coefficient?Pearson's correlation coefficient is a statistic that measures the strength and direction of the linear relationship between two quantitative variables.

It is a measure of the linear correlation between two variables, which ranges from -1 to 1. Pearson's correlation coefficient can be used to examine the degree of relationship between two continuous variables.

When it comes to Pearson's correlation coefficient, the following statements are correct:It can be used as an effect size measure.It can be used on ranked data.It cannot be used with a binary variable (those taking on a value of 0 or 1).It varies between -1 and +1.

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Answer:

the price that generates maximum profit is $152.94, rounded to the nearest cent.

Step-by-step explanation:

Let's begin by finding the profit generated by the promotion at each price point.

At $17.99/person:

Profit = Revenue - Cost

Profit = $17.99 x 112 - (10 + 5 + 3) x 112

Profit = $2016.64

At $19.99/person:

Profit = Revenue - Cost

Profit = $19.99 x 96 - (10 + 5 + 3) x 96

Profit = $1497.12

To find the price that generates maximum profit, we need to use the formula:

Price = (Fixed Cost + Variable Cost) / Number of Customers + Profit per Customer

We can assume that the fixed cost for the restaurant is $10,000 per day, and the variable cost per person is $5 for ingredients and $3 for labor.

For $17.99/person:

Price = ($10,000 + (5 + 3) x 112) / 112 + ($2016.64 - $17.99)

Price = $152.94

For $19.99/person:

Price = ($10,000 + (5 + 3) x 96) / 96 + ($1497.12 - $19.99)

Price = $156.24

Therefore, the price that generates maximum profit is $152.94, rounded to the nearest cent.

Answer:

Let B be the other endpoint of AB.

We know that the midpoint M of AB has coordinates (5, -9), which means that the average of the x-coordinates of A and B is 5, and the average of the y-coordinates of A and B is -9:

Substituting the coordinates of point A (-8, 4), we can solve for the x-coordinate of point B:

Simplifying the equation, we get:

Now, substituting the same coordinates of point A and the y-coordinate of midpoint M (-9), we can solve for the y-coordinate of point B:

Simplifying the equation, we get:

The chances that Nikolas will be falsely accused in a polygraph test are dependent on the accuracy of the test and the criteria used to determine guilt or innocence.

Polygraph tests, also known as lie detector tests, are controversial and have varying degrees of accuracy. The accuracy of a polygraph test depends on many factors, including the expertise of the administrator, the type of test administered, and the physiological response of the individual being tested.

Furthermore, the criteria used to determine guilt or innocence based on the results of a polygraph test can vary. In some cases, a single inconclusive result may be enough to exonerate an individual, while in other cases, a single positive result may be enough to accuse an individual.

It is not possible to provide a specific numerical probability for the chances of Nikolas being falsely accused in a polygraph test.

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The correct order of the polynomial [tex]7x^3y^3 - 3xy^5 + 2x^2y^4 - x^4y^2[/tex] in descending powers of x is:

[tex]-x^4y^2 + 7x^3y^3 + 2x^2y^4 - 3xy^5[/tex]

Therefore, the answer is option A.

What is polynomial function?

A polynomial function is a mathematical function that consists of a sum of terms, where each term is a constant multiplied by one or more variables raised to a non-negative integer power.

When we arrange a polynomial in descending order of powers of one of its variables, it means we are writing the terms with the highest power first, followed by terms with the next highest power, and so on until we reach the constant term (which has no variable).

In this case, the polynomial is [tex]7x^3y^3-3xy^5+2x^2y^4-x^4y^2[/tex]. To write this in descending order of powers of x, we need to start with the term that has the highest power of x, which is [tex]-x^4y^2[/tex].

Then we write the term with the next highest power of x, which is [tex]7x^3y^3[/tex]. After that, we write the term with the next highest power of x, which is [tex]2x^2y^4[/tex]. Finally, we write the term with the lowest power of x, which is [tex]-3xy^5[/tex].

So the correct order of the polynomial in descending powers of x is option A: [tex]-x^4y^2+7x^3y^3+2x^2y^4-3xy^5[/tex].

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Answer:

Your answer of 4¹⁸ is correct.

Step-by-step explanation:

In (4⁶)³ the exponents would be multiplied. 6 multiplied by 3 is 18 and therefore the correct answer would be 4¹⁸

Answer:

B. 4^18

Step-by-step explanation:

(4^6)= 4096

(4096)^3= 68,719,476,736

So, (4^6)^3= 68,719,476,736

AND

4^18= 68,719,476,736

Hope it helped! :)

Brainliest? Please.

We use factoring to solve the first Equation, x² + 4x = 15, and use the zero product property to solve the second equation, 2x(x−3)=0.

For the first equation, x² + 4x = 15, we can use the quadratic formula or completing the square technique to solve it. However, since the equation is already in standard form, we can use factoring to solve it. By rearranging the equation, we get x² + 4x - 15 = 0. This can be factored as (x + 5)(x - 3) = 0. Therefore, the solutions are x = -5 and x = 3.

For the second equation, 2x(x−3)=0, we can use the zero product property to solve it. This property states that if the product of two factors is equal to zero, then at least one of the factors must be equal to zero. Therefore, we have 2x = 0 or x - 3 = 0. Solving for x, we get x = 0 or x = 3. These are the solutions to the equation.

In summary, we use factoring to solve the first equation, x² + 4x = 15, and use the zero product property to solve the second equation, 2x(x−3)=0.

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Explanation:

We want a dice sum larger than 8. Meaning we want the sum to be either: 9, 10, 11, or 12

Here are the four ways to add to 9

3 + 6 = 9

4 + 5 = 9

5 + 4 = 9

6 + 3 = 9

Here are the three ways to add to 10

4 + 6 = 10

5 + 5 = 10

6 + 4 = 10

and here are the two ways to add to 11

5 + 6 = 11

6 + 5 = 11

and finally there's only one way to get a sum of 12

6 + 6 = 12

There are 4+3+2+1 = 10 different sums we want out of 6*6 = 36 dice rolls possible.

That's how we get to 10/36 as the final answer.

10/36 reduces to 5/18, but it appears your teacher decided not to reduce.

The correct option is D.

The probability of rolling a value higher than eight with a pair of fair dice is 4/36 or 1/9.What is the probability of rolling a value higher than eight with a pair of fair dice?To find the probability of rolling a value higher than eight with a pair of fair dice, you have to find the number of ways to get a sum greater than 8 and divide it by the total number of possible outcomes when rolling two dice.The maximum sum that can be obtained by rolling two dice is 12 (6 + 6). So, we need to find the number of ways that we can obtain 9, 10, 11, or 12. The possible combinations are:(3,6), (4,5), (5,4), (6,3), (4,6), (5,5), (6,4), (5,6), (6,5), and (6,6).Therefore, there are 10 possible outcomes in which the sum of the two dice is greater than 8. The total number of possible outcomes when rolling two dice is 6 × 6 = 36.So, the probability of rolling a value higher than eight with a pair of fair dice is:10/36 = 5/18 or approximately 0.277 or 27.7%.

Therefore the correct answer is option D ) 8/36.

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If integers a, b, c, and d, not necessarily distinct, are chosen independently and at random from 0 to 2007, the probability that ad-bc is even is 10/16.

To solve the problem, we need to consider the parity of the product ad and bc separately. If both ad and bc are even, then their difference (ad-bc) is even. If both ad and bc are odd, then their difference is even as well. However, if one of ad and bc is odd and the other is even, then their difference is odd.

For ad to be even, either a or d (or both) must be even. Similarly, for bc to be even, either b or c (or both) must be even. Therefore, the probability that ad and bc are both even is the product of the probabilities that a, b, c, and d are even:

P(ad even) = P(a even)P(d even) = (1004/2008)^2 = 1/4

P(bc even) = P(b even)P(c even) = (1004/2008)^2 = 1/4

The probability that ad-bc is even is the sum of the probabilities that both ad and bc are even and that both ad and bc are odd:

P(ad-bc even) = P(ad even and bc even) + P(ad odd and bc odd)

= P(ad even)P(bc even) + P(ad odd)P(bc odd)

= 1/4 * 1/4 + 3/4 * 3/4

= 1/16 + 9/16

= 10/16

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The Equation of the linear function is y = 2x + 1.

Here's a step-by-step explanation using the terms you've provided:

1. Identify the slope (m) and y-intercept (b): In a linear function, the equation is typically written in the form y = mx + b, where m represents the slope and b represents the y-intercept.

2. Find the slope: If you're given two points on the line (x1, y1) and (x2, y2), you can find the slope by using the formula: m = (y2 - y1) / (x2 - x1).

3. Determine the y-intercept: If you know the slope and one point on the line (x, y), you can find the y-intercept by rearranging the equation: b = y - mx.

4. Write the equation: Once you have the slope and y-intercept, you can write the equation in the form y = mx + b.

For example, suppose you are given two points on a line: (1, 3) and (3, 7). To write the equation of the linear function:

Step 1: Find the slope (m):
m = (7 - 3) / (3 - 1) = 4 / 2 = 2

Step 2: Determine the y-intercept (b) using one of the points, say (1, 3):
b = 3 - (2 * 1) = 1

Step 3: Write the equation:
y = 2x + 1

So, the equation of the linear function is y = 2x + 1.

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The equations of the directrices are x = -3.6 and x = 3.6.

To find the equations of the directrices for a hyperbola, we need to first identify its major components.

Since the hyperbola is centered at the origin, its center is (0, 0). We are given a vertex at (-6, 0) and a focus at (10, 0).
1. Determine the value of a and c:
Since the vertex is at (-6, 0), the distance from the center to the vertex is |a| = 6.
Since the focus is at (10, 0), the distance from the center to the focus is c = 10.
2. Calculate the value of b using the relationship[tex]c^2 = a^2 + b^2:[/tex]
[tex]c^2 - a^2 = b^2[/tex]
[tex]10^2 - 6^2 = b^2[/tex]

[tex]10^2 - 6^2 = b^2[/tex]
[tex]100 - 36 = b^2[/tex]
[tex]64 = b^2[/tex]
b = 8
3. Find the distance from the center to the directrices (d) using the relationship [tex]d = a^2 / c[/tex]:
[tex]d = a^2 / c[/tex]
[tex]d = 6^2 / 10[/tex]
d = 36 / 10
d = 3.6
4. Determine the equations of the directrices:
Since the hyperbola is horizontal, the directrices will be vertical lines.

The directrices are located at a distance of d from the center, so their equations are x = ±d.

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I hope the solution helps you.

The area of the polygon with 12 sides is 48 square units.

To find the area of a regular polygon with 12 sides and a radius of 4 units, we can use the formula:

A = 12 * Area of 1 triangle

Where

Area of 1 triangle = 1/2 * radius * sin(360/n)

So, we have

Area of 1 triangle = 1/2 * 4^2 * sin(360/12)

Area of 1 triangle = 1/2 * 4^2 * sin(30)

Evaluate

Area of 1 triangle = 4

Substituting the given values, we get:

A = 12 * 4

Evaluate

Area = 48

So the area is 48 square units.

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Having factorized using identities, the result is [(a^2c + b^2a + c^2b)/(abc)][(a^2 + b^2 + c^2 - a^2b^2c^2)/(a^2b^2c^2)]

One possible approach to factorizing the expression is to use the identity:

a^3 + b^3 + c^3 - 3abc = (a + b + c)(a^2 + b^2 + c^2 - ab - ac - bc)

If we let a = b/c, b = c/a, and c = a/b, then we can substitute these expressions into the identity and simplify:

(a/b)^3 + (b/c)^3 + (c/a)^3 - 3abc/a^3b^3c^3

= [(a/b) + (b/c) + (c/a)][(a/b)^2 + (b/c)^2 + (c/a)^2 - (a/b)(b/c) - (a/b)(c/a) - (b/c)(c/a)]

= [(a^2c + b^2a + c^2b)/(abc)][(a^2 + b^2 + c^2)/(a^2b^2c^2) - 1]

= [(a^2c + b^2a + c^2b)/(abc)][(a^2 + b^2 + c^2 - a^2b^2c^2)/(a^2b^2c^2)]

Therefore, the factorization of the given expression is:

(a/b)^3 + (b/c)^3 + (c/a)^3 - 3 = [(a^2c + b^2a + c^2b)/(abc)][(a^2 + b^2 + c^2 - a^2b^2c^2)/(a^2b^2c^2)]

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Answer:

2 bus

Step-by-step explanation:

The expected value of y is larger than the expected value of x. This is because y takes into account the number of students on all 4 buses, while x only takes into account the students on the bus with the randomly selected student.

The expected value of a random variable represents the average value of that variable over multiple trials. In this case, x is a random variable representing the number of students on the bus carrying the randomly selected student, and y is a random variable representing the number of students on the randomly selected bus.

The expected value of x can be calculated as follows:

E[x] = (10/100)×10 + (20/100)×20 + (30/100)×30 + (40/100)×40

= 16 + 12 + 9 + 16

= 53/4

= 13.25

This means that, on average, the bus carrying the randomly selected student would have 13.25 students.

The expected value of y can be calculated as follows:

E[y] = (1/4)×10 + (1/4)×20 + (1/4)×30 + (1/4)×40

= 25

This means that, on average, the randomly selected bus would have 25 students.

As expected, the expected value of y is larger than the expected value of x. This is because y takes into account the number of students on all 4 buses, while x only takes into account the students on the bus with the randomly selected student. Since the number of students on the other 3 buses can vary widely, y has a higher expected value than x.

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the initial concentration of the solution in the tank is 0.04 kg/L.

Tank contains 80 kg of salt and 2000 L of water. A solution of a concentration 0.02 kg of salt per liter enters a tank at the rate 6 L/min. The solution is mixed and drains from the tank at the same rate.

What is the concentration of our solution in the tank initially?

Initially, the tank contains 80 kg of salt and 2000 L of water. To determine the initial concentration of the solution in the tank, we need to use the following formula:

concentration = mass of solute / volume of solution

In this case, the mass of solute (salt) is 80 kg and the volume of solution is 2000 L. Therefore, the initial concentration of the solution in the tank is:concentration = 80 kg / 2000 L = 0.04 kg/L

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