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?

42 feet below the sea level

Step-by-step explanation: To solve for the depth, simply just plug in 6 into the equation by substituting "m" since the variable represents minutes, and the submarine has been traveling for 6 minutes.

f(6) = -120 + 13(6)

f(6) = -120 + 78

f(6) = -42

When solved,  the answer is 42.

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