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IM: 7.5.12: Negative Rates (Practice)

By Newsela Staff
Last updated 6 days ago
16 Questions
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

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?

At what depth is it after 2 stages?

At what depth is it after 4 stages?

How many stages will it take to return to the surface?

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?

A tugboat traveled -1.5 miles in 0.3 hours. What was its velocity?

What do you think that negative distances and velocities could mean in this situation?

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? (Assume you have enough of the other ingredients.)

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?

Evaluate each expression. When the answer is not a whole number, write your answer as a fraction.

-4\cdot-6

-24\cdot\frac{-7}{6}

4\div-6

\frac{4}{3}\div-24