A small submarine started its dive at sea level and descended 25 feet per minute. Which integer represents the submarine’s depth after 6 minutes?

Question

a. 31
b. 150
c. -31
d. -150

Answer 1

b. 150

Since the submarine descends 25 feet per minute, after 6 minutes it would have descended 25 feet x 6 minutes = 150 feet. The depth would be represented by a positive integer, so the answer is 150.