Grade 7 | Unit 5 | Lesson 12: Negative Rates | Practice Problems

Describe a situation where each of the following quantities might be useful. -20 gallons per hour -10 feet per minute -0.1 kilograms per second

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A submarine is only allowed to change its depth by rising toward the surface in 60-meter stages. It starts off at -340 meters. At what depth is it after 1 stage?

• -280 meters

• -220 meters

• -100 meters

A submarine is only allowed to change its depth by rising toward the surface in 60-meter stages. It starts off at -340 meters. At what depth is it after 2 stages?

• -280 meters

• -220 meters

• -100 meters

A submarine is only allowed to change its depth by rising toward the surface in 60-meter stages. It starts off at -340 meters. At what depth is it after 4 stages?

• -280 meters

• -220 meters

• -100 meters

A submarine is only allowed to change its depth by rising toward the surface in 60-meter stages. It starts off at -340 meters. How many stages will it take to return to the surface?

• 6 stages

• 5 stages

• 7 stages

Some boats were traveling up and down a river. A satellite recorded the movements of several boats. A motor boat traveled -3.4 miles per hour for 0.75 hours. How far did it go?

• -2.55 miles

• -3.00 miles

• -2.75 miles

Some boats were traveling up and down a river. A satellite recorded the movements of several boats. A tugboat traveled -1.5 miles in 0.3 hours. What was its velocity?

• -5 miles per hour

• -4 miles per hour

• -6 miles per hour

Some boats were traveling up and down a river. A satellite recorded the movements of several boats. What do you think that negative distances and velocities could mean in this situation?

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A cookie recipe uses 3 cups of flour to make 15 cookies. How many cookies can you make with this recipe with 4 cups of flour?

• 20 cookies

• 15 cookies

• 18 cookies

A teacher uses 36 centimeters of tape to hang up 9 student projects. At that rate, how much tape would the teacher need to hang up 10 student projects?

• 40 centimeters

• 35 centimeters

• 45 centimeters