You have to have a better question to answer that, 100 feet more what?
Answer:
18
Step-by-step explanation:
÷ 
Keep Change Flip
×
= 
Answer: negative 6
Step-by-step explanation:
Since at the top of the mountain its already 0 and the degrees drop 3 each hour then multiply -3 by 2 hours and there you go.
-12,3 ...................................