Lesson 12

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

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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?

Some boats were traveling up and down a river. A satellite recorded the movements of several boats.

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A motor boat traveled -3.4 miles per hour for 0.75 hours. How far did it go?

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

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

Describe a situation where each of the following quantities might be useful.

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-20 gallons per hour

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-10 feet per minute

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-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:

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1 stage

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2 stages

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4 stages

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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? (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?

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?

-20 gallons per hour

-10 feet per minute

-0.1 kilograms per second

1 stage

2 stages

4 stages

How many stages will it take to return the surface?