NC.7.RP.2c Exam Prep

A store sells apples by the pound. The table shows the cost for different weights of apples. Which equation calculates the cost (c) for p pounds of apples?

• c = 0.67p

• p = 0.67c

• c = 1.5p

• p = 1.5c

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NC.7.RP.2c

A recipe calls for water and rice. For 2 cups of rice, 4 cups of water are needed. For 3 cups of rice, 6 cups of water are needed. Which equation can be used to determine the amount of water, w, needed for r cups of rice?

• w = 0.5r

• r = 0.5w

• w = 2r

• r = 2w

Answer explanation

The question asks you to solve for W so w = 2r is correct.

Had you been solving for R, then r = 0.5w would have been the correct choice.

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NC.7.RP.2c

The graph shows the number of pages a printer can print in a certain amount of time. Which equation will calculate the total number of pages, y, printed in x seconds?

• y = 0.25x

• y = 4x

• x = 0.25y

• x = 4y

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NC.7.RP.2c

The chart shows the number of pages in a book based on the number of chapters. Which equation calculates the number of pages in a book with x number of chapters?

• y = 15x

• y = 20x

• y = 30x

• y = 50x

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NC.7.RP.2c

A water pump fills a tank at a constant rate. It fills 30 gallons in 6 minutes and 65 gallons in 13 minutes. Let V represent the total volume of water in gallons, and m represent the time in minutes. Which equation represents this situation?

• V = 5m

• V = 30m

• V = 5 + m

• V = 30 + m

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NC.7.RP.2c

The table shows the total cost, y, for renting a bicycle, based on the number of hours, x. Which equation would calculate the cost for x hours of bicycle rental?

• y = x

• y = 8.50x

• y = x + 8.50

• y = x + 1

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NC.7.RP.2c

On a historical map, 10 inches represents 75 miles. Based on the map, which equation would calculate the number of miles between two landmarks, y, when they measure x inches apart on the map?

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NC.7.RP.2c

The weight of a certain type of metal tubing is directly proportional to its length. A 5-foot piece of tubing weighs 15 pounds. Which equation below represents the relationship between the weight in pounds, W, to the length in feet, L, of the tubing?

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NC.7.RP.2c

The table shows the earnings of a freelance graphic designer based on the number of hours worked. Which equation represents the total earnings, E, for h hours of work?

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NC.7.RP.2c

The table represents the total weight of apples based on the number of apples. Which equation could be used to calculate the total weight, W, for any number of apples, a?

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NC.7.RP.2c