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Part 1
The expression -270 + 16m represents a submarine that began at a depth of 270 feet below sea level and ascended at a rate of 16feet per minute. What was the depth of the submarine after 9 minutes?
To find the depth of the submarine after 9 minutes, we can substitute the value of 9 for m in the expression -270 + 16m.
Depth after 9 minutes = -270 + 16(9)
= -270 + 144
= -126
Therefore, the depth of the submarine after 9 minutes would be 126 feet below sea level.