Lesson 8 Review

Carmen is 5 1/4 years younger than Antoine. Katy is 11 1/2 years older than Carmen. To the nearest year, what is the difference in Antoine's age and Katy's age?

• Atoine is about 17 years older than Katy.

• Antoine is about 6 years older than Katy.

• Antoine is about 6 years younger than Katy.

• Antoine is about 17 years younger than Katy.

A scientist measures the change in the temperature of a chemical solution. At the start of the experiment, the solution is at a temperature of -14.96 degrees. The temperature decreases 2.9 degrees each hour.

Write an expression that can be used to find the temperature of the solution after 3 hours.

• -14.96 - 2.9(3)

• 2.9 - -14.96(3)

• 3 - - 14.96 (2.9)

• 2.9 - 3 (-14.96)

A scientist measure the change in the temperature of a chemical solution. At the start of the experiment, the solution is at a temperature of -14.96 degrees. The temperature decreases 2.9 degrees each hour.

What is the temperature of the solution after 3 hours, rounded to the nearest whole degree? ESTIMATE!!

• 24

• -24

• -13

• -6

Amalia is scuba diving at a position 24.25 feet below sea level. She descends 0.5 foot each minute for 25 minutes. What is Amalia's position compared to sea level after 25 minutes?

• 11.75

• 36.75

• -11.75

• -36.75

Which expression is the best estimate of 1 1/5 x 3 2/3?

• 2 x 4

• 1 x 4

• 2 x 3

• 1 x 3

Which expression is the best estimate of 1 1/5 x 3 2/3?

• 2 x 4

• 1 x 4

• 2 x 3

• 1 x 3

Estimate the answer to this problem

-6 3/5 - (-7 4/15) + 2 1/5

• -16

• 16

• -2

• 2

Find the actual answer to this problem

6 3/5 - (-7 4/15) + 2 1/5

• -2 3/15

• 2 13/15

• 15 13/15

• -7 2/15