Answer:
a. 234 ft
b. 102 ft
Explanation:
a. Checkpoint 1 = -179
-179 + 413 = ==> get the height of the top of the hill by adding 413 to
checkpoint 1
413 - 179 = 234 ft
b. -77 - (-179) = ==> get the difference between checkpoint 4 = -77 and
checkpoint 1 = -179
-77 + 179 = ==> subtracting a negative number is equivalent to adding a
positive number
179 - 77 = 102 ft