Question

question 24 of 25
which situation does not have quantities that combine to make 0?
a. in the morning, the temperature rises 30 degrees. in the evening, it falls by 30 degrees.

b. veronica receives $21 for babysitting. she then spends $21 on a new shirt.

c. a helicopter rises 40 feet. it then rises another 40 feet.

d. a car is filled with 10 gallons of gas. 10 gallons are then used on a drive across the state.

Explanation:

Step1: Analyze Option A

Let rise = +30, fall = -30.
$30 + (-30) = 0$

Step2: Analyze Option B

Let receive = +21, spend = -21.
$21 + (-21) = 0$

Step3: Analyze Option C

Let rise = +40, second rise = +40.
$40 + 40 = 80$

Step4: Analyze Option D

Let fill = +10, use = -10.
$10 + (-10) = 0$

Answer:

C. A helicopter rises 40 feet. It then rises another 40 feet.