A bike wheel has a radius of 13 inches. About how far does thhe bike wheel travel in 5 rotations? Explain.

Based οn the infοrmatiοn prοvided, we can see that the prοfit earned (p) is prοpοrtiοnal tο the number οf cοοkies sοld (c).

We can write the equatiοn as:

p = 0.25c

This equatiοn means that fοr every cοοkie sοld, the prοfit earned is $0.25. We can alsο write this equatiοn in slοpe-intercept fοrm as:

y = mx + b

where y represents prοfit earned (p), x represents the number οf cοοkies sοld (c), m represents the slοpe (0.25 in this case), and b represents the y-intercept (the value οf y when x is 0, which is 0 in this case).

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The formula to calculate the volume of a cylinder is:

V = πr^2h

where π is a constant equal to 3.14, r is the radius of the cylinder (which is half of the diameter), and h is the height of the cylinder.

To use Maria's expression, we can first calculate the radius of the cylinder:

diameter = 10 1/2 ft

radius = diameter/2 = 5 1/4 ft

Next, we can substitute the values of π and h into the expression 2ℎ:

2ℎ = 2(4 2/5 ft) = 8 4/5 ft

This expression represents the height of the water in the cylinder when it is filled to capacity. To find the volume of water that can fit in the pool, we can substitute the values of π, r, and h into the formula for the volume of a cylinder:

V = πr^2h = 3.14 × (5 1/4 ft)^2 × 8 4/5 ft ≈ 581.8 ft^3

Rounding to the nearest cubic foot, the approximate volume of water that Maria determined can fit into the pool is 582 cubic feet.

Shirley Benson earns $611.60 for a week in which she assembles 278 toys.

The correct answer is 611.60.

To answer the student's question, we can use the formula:
Earnings = Rate x Quantity
In this case, Shirley Benson is paid $2.20 for each toy she assembles.

She has assembled 278 toys in a week.

Therefore, her earnings for the week would be:
Earnings = $2.20 x 278
Earnings = $611.60.

The correct answer is 611.60

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In conclusion Your tax due is $9,096.

How to find?

To find your taxable income, you need to subtract your exemption from your adjusted gross income (AGI):

Taxable income = AGI - Exemption

Taxable income = $60,000 - $8,200

Taxable income = $51,800

To find your tax due, you need to use the tax table for single filers with a taxable income of $51,800. According to the 2021 tax tables, the tax due for a single filer with a taxable income of $51,800 is $9,096.

Therefore, your tax due is $9,096.

Tax is a compulsory financial charge or other type of levy imposed on an individual or a legal entity by a governmental organization in order to fund public expenditures. Taxes are typically calculated as a percentage of income, value of goods or services, or property.

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Probability equation of P(A/B)=  [tex]\frac{0.31}{0.31+0.17}=0.65[/tex]

let say A and B is not empty set then intersection of A and B is  a set of elements which are common in both two sets A and B .

given that A and B are two events and

probability of A= 0.31+0.30=0.61

probability of B= 0.31+0.17=0.48

probability of intersection of A and B is = 0.31

so,

P(A/B)= is the probability of event A occurring, given that event B occurs.

P(A/B) = intersection of A and B / probability of B

P(A/B) = [tex]\frac{0.31}{0.31+0.17}=0.65[/tex]

therefore , probability of PA/B) = 0.65  

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First Convert 15 kg to g

15kg × 1000 = 15000g

15000g - 822g = 14,178g

14178g ÷ 5 = 2,835.6g

Then convert the grams to kilograms

2,835.6g ÷ 1000 = 2.8356kg

2.8356kg × 5 = 14.178kg

Answer: 14.178kg

Answer:

the total weight of the remaining five components in kilograms is roughly 14.178 kg.

Step-by-step explanation:

1. divide the weight of the detergent in grams by 1000 to convert it to kilograms:

822 grams/1000 =  0.822 kilograms  

2 .subtract the weight of the detergent from the total weight of all six things to obtain the weight of the other five items:

15 kilos - 0.822 kilograms = 14.178 kilograms.

As a result, the total weight of the remaining five components in kilograms is roughly 14.178 kg.

13 is the inequality so that it represents the whole-number values.

What is Triangle Inequality Theorem?

Triangle inequality, in Euclidean figure, theorem that the sum of any two sides of a triangle is lesser than or equal to the third side; in symbols, a b ≥ c. In substance, the theorem states that the shortest distance between two points is a straight line.

the Triangle Inequality Theorem, which states that

the sum of the lengths of two sides of a triangle must always be greater than the length of the third side

      a = c + b

         = 7 + 6

         = 13

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The total number of possible outcomes of 1 spin of the arrow on the spinner and 1 roll of the number cube is 24.

Here's how to find the solution:

First, determine the number of outcomes for spinning the arrow on the spinner. There are four sections labeled W, X, Y, and Z. Therefore, the number of outcomes for spinning the arrow is 4.Next, determine the number of outcomes for rolling the number cube. There are six faces labeled 1, 2, 3, 4, 5, and 6. Therefore, the number of outcomes for rolling the number cube is 6.To find the total number of possible outcomes of 1 spin of the arrow on the spinner and 1 roll of the number cube, multiply the number of outcomes for spinning the arrow by the number of outcomes for rolling the number cube:4 × 6 = 24.Therefore, the total number of possible outcomes of 1 spin of the arrow on the spinner and 1 roll of the number cube is 24.

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So, the length of open rectangle box is 4cm, width is 4cm, and height is 2cm, with Surface Area of 48cm^2.

it is an Open box, so there is no top

SA (Surface area) = 2*l*h + 2*w*h + l*w

Volume(V) = l*w*h = 32cm^3

h = 32/(w*l)

SA = 2*l*32/(w*l) + 2*w*32/(w*l) + l*w

SA = 64/w + 64/l + l*w

Find minimum SA: take partial derivatives to get critical point(s)

SAw = -64/w^2 + l

SAl = -64/l^2 + w

Both the partials have to be 0, so...

0 = -64/w^2 + l and 0 = -64/l^2 + w

64/w^2 = l

0 = -64/(64/w^2)^2 + w (plug into second equation)

0 = -w^4/64 + w

0 = w(1-w^3/64)

1 = w^3/64 or 0 = w (impossible answer)

64 = w^3

4 = w

Plug w back into 64/w^2 = l

64/4^2 = l

4 = l

Plug w and l back into h = 32/(w*l)

h = 32/(4*4)

h = 2

The Surface Area:2*l*h + 2*w*h + l*w

SA = 2*4*2 + 2*4*2 + 4*4

SA = 48

So the answer is length = 4cm, width = 4cm, and height = 2cm, with Surface Area of 48cm^2

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the probability that the average age of a randomly selected sample of 100 students will be less than 21.8 years is 0.0564 rounded to three decimal places. The final answer is 0.056.

The problem given can be solved by using the central limit theorem.

According to the central limit theorem, if the sample size is sufficiently large, then the sample mean will follow a normal distribution with a mean of μ and a standard deviation of σ/√n, where n is the sample size.Using this formula, we can find the probability that the average age of a randomly selected sample of 100 students will be less than 21.8 years. The formula is:

P(Z < (X-μ)/(σ/√n))

where Z is the standard normal distribution, X is the value we want to find the probability for, μ is the population mean, σ is the population standard deviation, and n is the sample size.

In this case, X = 21.8, μ = 22, σ = 2, and n = 100. Plugging these values into the formula, we get:

P(Z < (21.8-22)/(2/√100)) = P(Z < -1.58)

Using Excel or a standard normal distribution table, we can find that the probability of Z being less than -1.58 is 0.0564.

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Given Data:

Number of miles covered in 25 minutes = 5

To Find:

Number of miles covered in 30 minutes = ?

Solution:

Number of miles covered per minutes = 5/25             (rate=distance/time)                          

                                                                =0.2 miles/minute

Number of miles covered in 30 minutes = 0.2*30

                                                                   =6 miles

The original number of grapes present in the container was 50.35.

To determine the number of grapes Ariana ate.

then, we'll find the number of grapes Alex ate.

Finally, we'll use the remaining grapes to determine the original number of grapes present in the container.

Let us solve the problem now.

Let the original number of grapes be x. Ariana ate 0.45 of them.

Number of grapes Ariana ate = 0.45x

Alex ate 35% of the remaining grapes after Ariana ate.

Number of grapes Alex ate = 35% of (x - 0.45x)= 35/100(x - 0.45x)= 0.35(0.55x)= 0.1925x

The number of grapes remaining = 18.Number of grapes remaining after both Ariana and

Alex ate = x - 0.45x - 0.1925x= 0.3575x= 18

Hence, we can determine that:0.3575x = 18x = 18/0.3575x = 50.35

The original number of grapes present in the container was 50.35.

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After answering the presented question, we can conclude that Pythagorean theorem Therefore, the value of x is 15.

The Pythagorean theorem is a fundamental mathematical principle that describes the relationship between the sides of a right triangle. It states that the sum of the squares of the other two sides' lengths equals the square of the hypotenuse's length (the side opposite the right angle). The mathematical theorem is as follows: c2 = a2 + b2 Where "c" denotes the hypotenuse length and "a" and "b" represent the lengths of the other two sides, known as the legs.

Pythagorean theorem

[tex]x^2 = 12^2 + y^2\\y/x = 3/5\\y = (3/5)x\\x^2 = 12^2 + (3/5)^2 x^2\\(1 - (3/5)^2) x^2 = 12^2\\(1 - 9/25) x^2 = 12^2\\(16/25) x^2 = 12^2\\x^2 = (25/16) * (12^2)\\x = (5/4) * 12 = 15\\[/tex]

Therefore, the value of x is 15.

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Answer:

The average rate of change of the function h(x) over the interval between 2 points (a , h(a)) and (b ,h(b)) is the

slope of the secant line

connecting the points.

It is found using.

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

∣

2

2

h

(

b

)

−

h

(

a

)

b

−

a

2

2

∣

∣

∣

−−−−−−−−−−−−−−−−

h

(

b

)

=

h

(

2

)

=

2

2

+

3

(

2

)

−

1

=

9

h

(

a

)

=

h

(

0

)

=

−

1

⇒

9

−

(

−

1

)

2

−

0

=

10

2

=

5

This means that the average of all the slopes of tangents between (2 ,9) and (0 ,-1) is 5

Therefore , the solution of the given problem of inequality comes out to be  150 units per employee, to satisfy the production demand.

Despite the fact that algebra lacks a comparable symbol, its distinction can be expressed by a pair or collection for numbers. Equilibrium is typically followed by equity. The ongoing disparity in norms is what causes inequality. Disparity and fairness are not synonymous. Even though the components are typically not connected or situated closely together, that was our most popular symbol.

Here,

A) Assume Y is the number of units created and X is the number of employees. The following inequalities represent the circumstances in the issue:

=> 100 ≤ X ≤ 200 (the factory must have at least 100 but no more than 200 workers)

=> Y ≥ 30X (the factory must manufacture at least 30 units per worker)

B) The lines 100, 200, and 30X would form the borders of the darkened area.

C) The following three options meet the set of inequalities:

=> X = 100, Y = 3000

=> X = 150, Y = 4500

=> X = 200, Y = 6000

The factory in the second solution employs 150 people and generates 4500 units, or 150 units per employee, to satisfy the production demand.

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Answer:

The surface area of a cube can be calculated using the formula 6s^2, where s is the length of one of the sides of the cube.

In this case, s = 5 inches, so the surface area would be:

6(5 in)^2 = 6(25 in^2) = 150 in^2

Therefore, the surface area of the cube that measures 5 inches on each side is 150 in^2. So the answer is c) 150 in^2.

Step-by-step explanation:

To find the surface area of a cube, we use the formula:

Surface area = 6s^2

where s is the length of one of the sides of the cube.

In this case, the length of each side of the cube is given as 5 inches.

Substituting this value into the formula, we get:

Surface area = 6 x 5^2

Surface area = 6 x 25

Surface area = 150 square inches

Therefore, the surface area of the cube is 150 square inches.

The standard error of the mean is approximately 19.

The standard error of the mean (SEM) can be calculated using the following formula:

SEM = σ / sqrt(n)

where σ is the population standard deviation, n is the sample size, and sqrt() denotes the square root.

Since the population standard deviation (σ) is not given, we can estimate it using the sample standard deviation (s) as follows:

σ ≈ s

Therefore, the formula for SEM can be rewritten as:

SEM ≈ s / sqrt(n)

Substituting the given values, we get:

SEM ≈ 190 / sqrt(100)

= 190 / 10

= 19

So the standard error of the mean is approximately 19.

The standard error of the mean measures the variability of the sample means around the population mean. It is the standard deviation of the sampling distribution of the mean, and it represents the amount of error that can be expected when using the sample mean as an estimate of the population mean.

To calculate the SEM, we need to know the population standard deviation or estimate it using the sample standard deviation. Since we only have the sample standard deviation in this case, we use it as an estimate of the population standard deviation. Then, we apply the formula for SEM and simplify it to obtain the final answer.

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Answer:
the translated point A' has coordinates (1,9).
Explanation:
To translate the point A(2,7) by the rule (x,y) → (x-1, y+2), we can apply the rule to the x-coordinate and the y-coordinate separately. Subtracting 1 from the x-coordinate and adding 2 to the y-coordinate will give us the new coordinates of the translated point.

Using this rule, we have: A'(x,y) = (2-1, 7+2) = (1, 9)

Therefore, the translated point A' has coordinates (1,9).

To get the answer, we applied the given rule to the x and y coordinates of the point, separately. In other words, we substituted x = 2 and y = 7 into the expressions x-1 and y+2, respectively, to obtain the new x-coordinate and the new y-coordinate.

So, the sophisticated answer is that to translate a point by a given rule, you apply the rule to each coordinate separately, and then combine the results to form the coordinates of the translated point.

Answer:

Point A' has coordinates (1,9).

Step-by-step explanation:

I did the test

Hope this helps :)

The answer of question no. 3 is the polygon has 18 sides.

A polygon is a two-dimensional geometric figure that is defined by a closed path of straight line segments. The segments, called sides, intersect at their endpoints, called vertices, and the angles formed by adjacent sides are called interior angles.

Polygons can have any number of sides, but they must have at least three sides (and therefore, three vertices). The most common polygons are the triangle (three sides), quadrilateral (four sides), pentagon (five sides), hexagon (six sides), heptagon (seven sides), octagon (eight sides)

For any polygon, the sum of the exterior angles is always 360 degrees. Therefore, if one exterior angle of a polygon is 20 degrees, then the polygon must have:

360 / 20 = 18 sides.

Therefore, the polygon has 18 sides.

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The value of angle x = 10.

An angle is the result of the intersection of two lines.

An "angle" is the length of the "opening" between these two beams.

Angles are commonly measured in degrees and radians, a measurement of circularity or rotation.

In geometry, an angle can be created by joining the extremities of two rays. These rays are intended to represent the angle's sides or limbs.

The two primary components of an angle are the limbs and the vertex. The joint vertex is the common terminal of the two beams.

According to our question-

2x+3 + 5x+17= 90°

7x+20=90

7x=70

x=10

Hence, The value of angle x = 10.

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a. Based on the chi-squared goodness of fit test, we do not have enough evidence to conclude that mice show a preference towards one paw over the other, with a calculated chi-squared value of 2.5 and a critical value of 3.84 at a significance level of 0.05.

b. The problem with repeating the analysis from part (a) with the new dataset of 480 observations is that the data is no longer independent due to repeated measures. A different statistical test that takes into account repeated measures, such as a repeated measures ANOVA, would need to be used to properly analyze this new dataset.

a. To test whether the data suggests that mice show a preference towards one paw over the other, we can use a chi-squared goodness of fit test. The null hypothesis for this test is that there is no preference towards one paw over the other, while the alternative hypothesis is that there is a preference towards one paw over the other.

The observed frequencies are

Right paw: 18 mice

Left paw: 30 mice

We can calculate the expected frequencies assuming no preference using the formula:

Expected frequency = (total number of observations * probability of right paw use) or (total number of observations * probability of left paw use)

Expected frequency of right paw use = 48 * 0.5 = 24

Expected frequency of left paw use = 48 * 0.5 = 24

We can now calculate the chi-squared test statistic using the formula:

chi-squared = sum((observed frequency - expected frequency)^2 / expected frequency)

Substituting the observed and expected frequencies into the formula:

chi-squared = ((18 - 24)^2 / 24) + ((30 - 24)^2 / 24) = 2.5

Using a chi-squared distribution table with one degree of freedom and a significance level of 0.05, the critical value is 3.84.

Since the calculated chi-squared value (2.5) is less than the critical value (3.84), we fail to reject the null hypothesis. Therefore, we do not have enough evidence to conclude that mice show a preference towards one paw over the other.

b. The problem with repeating the analysis from part (a) with the new dataset of 480 observations is that the data is no longer independent. Since each mouse was observed 10 times, the observations for each mouse are not independent, and treating them as such would violate the assumptions of the chi-squared goodness of fit test. To properly analyze this new dataset, a different statistical test that takes into account repeated measures, such as a repeated measures ANOVA, would need to be used.

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The given question is incomplete, the complete question is:

Do mice show a preference for using one paw over the other? Attempting to answer this question, a researcher tested a random sample of 48 mice and observed which forepaw (right or left) the mice used to retrieve food from a narrow tube. Eighteen of the mice used their right paw, while the rest used their left paw.

a. Does this data suggest that mice show a preference towards one paw over the other? Carry out the appropriate test and include all steps for full credit. Given: critical value = 3.84

b. During the experiment, the researcher noticed that individual mice sometimes switched which forepaw they used to retrieve the food. So she repeated this study on the same 48 mice, but measured each one 10 times and she recorded which forepaw was used each time. What would be the problem with repeating the analysis ran in part (a) with her new dataset of 480 observations? Be specific.

Abοut 68% οf sixth-grade students will have heights between 55.7 inches and 60.3 inches.

Mean is the average value οf the set given. It is calculated as:

Mean = Sum οf all the values οf the set given / Number οf values in the set

We have,

The standard deviatiοn is a measure οf hοw tο spread οut a set οf data frοm its mean.

In this case,

The standard deviatiοn is 2.3 inches, which means abοut 68% οf the data.

(in this case, the heights οf sixth-grade students) falls within οne standard deviatiοn οf the mean.

This is knοwn as the empirical rule οr the 68-95-99.7 rule.

Specifically, abοut 68% οf students will have heights between οne standard deviatiοn belοw the mean.

(58 - 2.3 = 55.7 inches).

And οne standard deviatiοn abοve the mean.

(58 + 2.3 = 60.3 inches).

Thus,

Abοut 68% οf sixth-grade students will have heights between 55.7 inches and 60.3 inches.

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Answer:

[tex]90 \div 15 = 6[/tex]

Answer:

6

Step-by-step explanation:

Answer: True.

explanation:  If a person makes a credit card payment earlier in the month versus later in the month, it will result in a lower average daily balance, lower interest owed, and a smaller minimum payment at the end of the billing cycle. Paying off your balance early or making additional payments before the billing cycle ends decreases your credit utilization.

The sample size is needed to achieve a margin of error of .05 for a 90% confidence interval for a proportion of interest to be near 0.25 is equals to the 203.

From the above problem we have,

Mardin of error, E = 0.05

confidence interval, α = 90%

proportion of interest, p = 0.25

We have to determine the sample size.

Using the formula for minimum sample size is written as n = (Z² × p(1 -p)]/E² --(1)

Using the Z-distribution table and the z-score value for 90% is equals to 1.645.

Plug all known values in above equation,

=> n = [(1.645)² × 0.25 ( 1 - 0.25)]/(0.05)²

=> n = (1.645)² × 0.25 ×0.75/(0.05)²

=> n = 0.5074/0.0025

=> n = 202.96 ~ 203

Hence, required sample value is 203

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Answer:

A line has slope of zero when it is a horizontal line.

We can use the recursive formula to find each term in the sequence.

From the given formula, we start with:

f(1) = 2

Next, we use the formula to find f(2):

f(2) = -3f(1) = -32 = -6

Using the formula again, we find f(3):

f(3) = -3f(2) = -3(-6) = 18

Now, we find f(4):

f(4) = -3f(3) = -318 = -54

Finally, we can find f(5):

f(5) = -3f(4) = -3(-54) = 162

Therefore, the 5th term in the sequence is 162, or answer (C).

1. The length of the fence required to enclose the circular pool with 4 feet of space around it is approximately 125.6 feet.

2.  If he runs around the track once he will still can't complete the goal he needs to run 20 more meters to meet his daily goal. Option A is the correct choice.

1.  To find the length of the fence required to enclose a circular swimming pool with a radius of 20 feet and a 4-foot space around it, we need to first calculate the diameter of the pool plus the space around it.

The diameter of the pool is twice the radius, which is 40 feet.

Adding 4 feet of space on both sides of the diameter gives us a total diameter of 48 feet.

The fence will be installed around the perimeter of this circular area, which is the circumference of the circle.

To calculate the circumference, we use the formula

C = 2πr

where C is the circumference, π is approximately 3.14, and r is the radius of the circle.

Plugging in the values, we get:

C = 2 x 3.14 x 20 feet = 125.6 feet.

2.

To calculate the distance around the swimming pool, we first need to find the total length of the semicircles, which is equal to half the circumference of a circle with a diameter of 35 meters.

The formula for the circumference of a circle is

C = πd

where C is the circumference and d is the diameter.

Plugging in the values, we get:

C = π x 35 meters / 2 = 54.99 meters

The total length of both semicircles is twice the length of one semicircle, which is

2 x 54.99 meters = 109.98 meters.

The length and width of the rectangular part of the pool are 80 meters and 35 meters, respectively.

Therefore, the distance around the rectangular part is

2 x (80 + 35) meters = 230 meters.

Adding the length of the semicircles to the length of the rectangle, we get the total distance around the swimming pool, which is

109.98 meters + 230 meters = 339.98 meters.

Therefore, Kevin needs to run at least 340 meters to meet his daily goal of 320 meters.

Since one lap around the high school track is only 320 meters, Kevin will need to run an additional 20 meters to meet his daily goal.

Thus, the correct answer is: option A "No, he will still need to run 20 more meters."

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Question:

1. A circular swimming pool has a radius of 20 feet. A fence is going to be built so that there is a 4-foot space around the entire pool. What is the length of the fence?

2. A swimming pool is comprised of a rectangle and 2 semicircles. The rectangle has length 80 meters and width 35 meters. The semicircles have diameters of 35 meters. Kevin needs to run 320 meters a day for his training program. He plans on running around the high school track shown. If he runs around the track once, will he meet his daily goal?

A. No, he will still need to run 20 more meters.

B. No, he will still need to run 100 more meters.

C. No, he will still need to run 150 more meters.

D. Yes, he met his daily goal.

Required function is f(x) = 2x-3.

What is function?

In mathematics, a function is a rule or a set of rules that assigns a unique output value to each input value. In other words, it is a way of relating one quantity to another. Functions are used in a variety of fields, such as engineering, physics, economics, and computer science, to describe relationships between variables.

An example of a function is the quadratic function f(x) = x² + 2x + 1. This function takes an input value x and produces an output value that is the result of squaring x, multiplying it by 2, and adding 1. For instance, if we substitute x = 3 in the function, we get:

f(3) = 3² + 2(3) + 1 = 9 + 6 + 1 = 16

To determine which function represents the data in the table, we need to substitute the given values of x into each function and compare the results with the corresponding values of f(x) given in the table.

If we use the function f(x) = 2x-3, we get:

f(0) = -3

f(1) = -1

f(2) = 1

f(3) = 3

f(4) = 5

f(5) = 7

We can see that these values match with the values given in the table, so the function that represents the data in the table is:

f(x) = 2x-3.

Therefore, we can conclude that the function f(x) = 2x-3 represents the data in the table.

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The correct system of equations that could be used to find x, the cost of a medium drink, and y, the cost of a large popcorn, is:

A) 2x + y = 13.85 3x + 2y = 23.9

To arrive at these equations, you can use the information given in the question to set up a system of linear equations. You know that 2 medium drinks and a large popcorn cost $13.85, so you can write:

2x + y = 13.85

where x is the cost of a medium drink and y is the cost of a large popcorn.

You also know that 3 medium drinks and 2 large popcorns cost $23.90, so you can write:

3x + 2y = 23.9

Then , you can solve the system of equations for x and y using any method you prefer, such as elimination or substitution. For example, one way to solve the system is to multiply the first equation by 3 to eliminate y:

6x + 3y = 41.55

Then you can subtract the second equation from this equation:

6x + 3y - (3x + 2y) = 41.55 - 23.9

Simplifying this equation gives:

3x + y = 17.65

You now have two equations to solve for x and y:

3x + y = 17.65 3x + 2y = 23.9

This system of equations is equivalent to the system shown in answer A.

Answer:

A

Step-by-step explanation:

The answer is (A) because, first off you have 2 medium drinks. So that is 2x. Second you only have 1 large popcorn. So that is just y. Right now the equation is 2x + y =$13.85. The next part of the problem is the same thing. You have only 1 more medium drink this time, so it is 3x. Then you have 1 more large popcorn, so that is 2y. The final part of the equation is 3x + 2y =$23.90. Since 23.90 is just a decimal you can just get rid of the 0. Now the equation should look like this, 2x + y=$13.85

3x + 2y=$23.9