7.5.12 Check Your Understanding

Which of the following situations could represent -20 gallons per hour?

• A car losing fuel

• A tank being filled

• A river flowing

• A plant growing

Fill in the blank: A submarine starting from -340 meters. rises 60 meters per stage, after 4 stages it will be at ______ meters.

• -100

• -80

• -60

• -40

Describe a situation where -0.1 kilograms per second might be useful.

• Measuring weight loss

• Calculating fuel consumption

• Monitoring water flow

• Tracking plant growth

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.)

• 20 cookies

• 18 cookies

• 16 cookies

• 22 cookies

Evaluate the expression -4 × -6.

• 24

• -24

• 20

• -20

Evaluate the expression 4 ÷ -6.

• -2/3

• 2/3

• -3/2

• 3/2

When multiplying or dividing if the signs are the same the answer will be _______?

• Positive

• Negative

When multiplying or dividing if the signs are different the answer will be _______?

• Positive

• Negative

If you run 15 laps per practice, how many practices will it take you to run 30 laps?

• 2

• 4

• 6

• 8

I can solve problems using the four operations with rational numbers.

• Yes

• No