Question

The expression -360 + 15z represents a submarine that began at a depth of 360 feet below sea level and ascended at a rate of 15 feet per minute. What is the depth of the submarine after 5 minutes?

Answer 1

285 ft below sea level

Explanation:

Substitute 5 for z.

-360 + 15(5)

-360 + 75 = -285

Therefore, the submarine is 285 feet below sea level after 5 minutes.