Adding and Subtracting Negative Numbers with Temperature, Elevation, and Money

At the beginning of the week I had $100 in my bank account. By Friday, I had a debt of $20. What integer represents the CHANGE in the amount of money I have?

• 120

• -120

• 80

• -80

Find the value of the expression (-8.6) + 7.2

• -1.4

• 1.4

• 15.8

• -15.8

-8.76 - (-5.65)

• 3.11

• -3.11

• 14.41

• -14.41

A diver is standing on a platform that is 20 feet above sea level. She dives to the bottom of the lake which is 40 feet below sea level. What is the vertical distance between the platform and the bottom of the lake?

• 60 ft

• 40 ft

• -20 ft

• -40 ft

Yesterday, the temperature at noon was 11.4 degrees F. By midnight, the temperature had decreased by 15.7 degrees. What was the temperature at midnight?

• -4.3

• -11.4

• -15.7

• -27.1

Answer explanation

Altitude above sea level is given in positive values and below sea level is given in negative values. Which situation describes a hiker in Death Valley stopping at an altitude of 0 feet?

• The hiker starts at -10 feet then increases altitude by 10 feet.

• The hiker starts at -10 feet then decrease altitude by 10 feet.

• The hiker starts at 10 feet then increases altitude by 10 feet

• The hiker starts at 0 feet then decreases altitude by 10 feet.

If Johnny starts at sea level and then climbs 10 feet up a cliff, then jumps into the ocean below reaching 25 feet below sea level, how far did he travel?

• 45

• -45

• 35

• -35

Bethany borrowed $22 from her friend. She then earned some money babysitting over the weekend, and was able to pay her friend back. Now Bethany has $33. How much money did Bethany earn babysitting over the weekend? (Do NOT label your answer.)

A shark was at a depth of -12 meters and then dives an additional 13.67 meters. What is the new depth of the shark? (Do NOT label your answer.)

At midnight, the temperature is 28 degrees Fahrenheit. The temperature 

decreases 2 degrees each hour until 2:00 A.M. The temperature then increases 3 degrees each hour until 5:00 A.M. What is the temperature at 5:00 A.M?.

• 33 degress

• 30 degrees

• 28 degrees

• 4 degrees