Question

1. from 12:00 midnight to 6:00 a.m., the temperature decreased by 12°c. the original temperature was 12°c, which expression can be used to represent the student?

a. 12 - 12
b. 12 + 12
c. 12 - (-12)
d. -12 + (-12)

Explanation:

Step1: Identify initial value and change

Initial temperature: $12^\circ\text{C}$, decrease of $12^\circ\text{C}$ means subtracting 12.

Step2: Match to expression

A decrease from the initial value is written as $12 - 12$.

Answer:

A. 12-12