Unit 4 CBA Review

Rob is buying shirts at his favorite sports store. The store is having a huge sale, so Rob can get each shirt for only $2. Rob also has a coupon for $5 off his total purchase.

Which equation can be used to find y, the total cost to buy x shirts?

•  $y=2x+5$  

•  $y=2x-5$  

•  $y=5x-2$  

•  $y=5x+2$  

• F

• G

• H

• J

What is the constant of proportionality for this table?

• $1/9 per hour
• $9 per hour
• $8 per hour

The cost of 3 pounds of grapes is $6.57. What is the constant of proportionality that relates the cost in dollars, y, to the number of pounds of grapes, x?

• 6.57

• 3

• 2.19

• Not here

Josefina deposited $250 into her savings account. She then saved $40 per month. Which of the following equations shows y, the amount in Josefina’s saving account after x months?

• y=250+40x

• y=250-40x

• y=40+250x

• y=40+210x

Which equation best represents the relationship between x and y in the graph? (7.7A)

• y = 2x + 4

• y = 2x - 2

• y = 1/2x + 4

• y = 1/2x - 4

A fish is swimming at a constant rate toward the ocean floor. The equation  $y=-5x-2$  can be used to represent this situation, where y is the depth of the fish in meters below sea level and x is the number of seconds the fish has been swimming.  Which statement best describes the depth of the fish, given this equation?

• From a starting position of 5 meters below sea level, the fish is descending 2 meters per second.

• From a starting position of 5 meters below sea level, the fish is ascending 2 meters per second.

• From a starting position of 2 meters below sea level, the fish is descending 5 meters per second.

• From a starting position of 2 meters below sea level, the fish is ascending 5 meters per second.

Frank and his family drove 6 hours every day during a road trip. Which graph best represents y, the total number of hours driver in x days?

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A dolphin travels through the water of a speed of 25 kilometers per hour. Which representation shows the distance a dolphin can travel at this rate? (7.4A)

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What is the constant rate of change between the quantities in the table?

• 4 calories per minute

• 15 calories per minute

• 40 calories per minute

• 60 calories per minute