Question

If the expression -120 + 13m represents a submarine that began at a depth of 120 feet below the sea level an ascended at a rate of 13 feet per minute. What was the depth of the submarine after 6 minutes????!!!!!!!

Answer 1

42 ft

Explanation:

`- 120 + 13m \\ = - 120 + 13 * 6..(plug \: m = 6 )\\ = - 120 + 78 \\ = - 42 \: ft`

(Negative sign symbolises that the submarine is below the sea level or depth of the submarine.)

Hence, the depth of the submarine after 6 minutes was 42 ft.