Math word problem? ?

Question

During an emergency exercise, a submarine dives 37 ft, rises 16 ft, and then dives 18 ft. What is the net change in the submarine's position after the secind dive?

Answer 1

it is 39 feet below water

you subract the 16 from 37

then you add the 18 to the product of the last part.

Answer 2

39 feet

Answer 3

-37+16-18

-21-18 or -21+(-18)

-39