Math 7H Review Unit 1

The temperature of a substance is -16.6 °C. During an experiment, the temperature of the substance decreases 7.5 °C. What is the final temperature?

• 24.1

• -24.1

• 9.1

• -9.1

Tue is diving 8 1/2 feet below sea level. He decides to descend 5 1/2 more feet. How many feet below sea level is he?

• 13 2/2

• 14

• -14

• -13 2/2

Julia spends $5.25 on gas for her lawn mower. She earns $24.00 mowing her neighbor’s yard. What is Julia’s profit?

• 18.75

• -18.75

• 29.75

• .29.75

Ruth cuts 3/4 inch sections of wood to make a birdhouse roof. He cut 35 sections. How many inches did she cut?

• 26 1/4

• -26 1/4

• 105/4

• -105/4

A football team gained 9 yards on one play and then lost 22 yards on the next. Write a sum of integers to find the overall change in field position.

• -9 + (-22) = -13

• 9 + (-22) = 13

• 9 + (-22) = -13

• none

When you add opposites, what do you get?

• 0

• A negative number

• Attraction

• You cannot add opposites

3 + -7

• 10

• 4

• -10

• -4

-2 + 4 

• -2

• 2

• 0

• -4

-9 + (-5)

• -14

• 14

• -4

-7 - 2

• -9

• 9

• 5

• -5