Question

The temperature at a mountain base camp was −4 degrees Celsius on Saturday. Sunday morning, the temperature was 2 degrees Celsius lower than it was on Saturday. By Sunday evening, the temperature was 1 degree Celsius lower than it was that morning. What was the temperature at the base camp Sunday evening?

Answer 1

we don't *really* need the answer choices, but just in case:

−9 degrees Celsius
−8 degrees Celsius
−7 degrees Celsius
−5 degrees Celsius

anyway: on Saturday, you start with -4 degrees C.
Sunday morning: it's 2 degrees lower, so subtract 2 from the Sat. temp.
Sunday evening: it's 1 degree even lower, so subtract 1 from the previous value.
final solution should be your temp @ the end of sunday evening.