Scientists in a two-man submarine descend at a rate of 4 feet per minute for 7 minutes, then ascend 3 feet in the eighth minute to examine an object. The expression

Question

represents the net change in the level of the submarine over the 8 minutes.

What value represents the net change in the level of the submarine over the 8 minutes?

Responses
A
negative 31
B
31
C
negative 25
D

Answer 1

25