Answer:
75
Explanation:
Problem (a) is answered ( as an example ) and (b) is referring to adding 292 to checkpoint 5.
Since checkpoint 5 is -217, it is in the negatives.
We must convert that to a positive and subtract then.
So, 292 - 217 = 75.
Therefore, the answer is 75 feet above sea level.
-kiniwih426