Question: From 12:00 midnight to 6:00 a.m., the temperature decreased by 12°C. If the original temperature was 12°C, which expression can be used to represent this situation?
A) 12-12
B) 12+12
C) 12-(-12)
D) -12+(-12)
Correct answer: A
Grade: 7 | Topic: Number System | Difficulty: Easy | Standard: 7.NS.A.1a