Question

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

Explanation:

Step1: Identify the value of m

The time elapsed is 6 minutes, so \( m = 6 \).

Step2: Substitute m into the expression

Substitute \( m = 6 \) into \( -120 + 13m \). We get \( -120 + 13\times6 \).

Step3: Calculate the multiplication

First, calculate \( 13\times6 = 78 \).

Step4: Calculate the addition

Then, calculate \( -120 + 78 = -42 \). The negative sign indicates the depth is 42 feet below sea level.

Answer:

The depth of the submarine after 6 minutes is 42 feet below sea level (or -42 feet if we consider the sign convention).