A submarine descends at a rate of 20 feet each
minute. What elevation is the submarine at after 5 minutes?
What was the original elevation?
descends at "20 feet each" what? If minutes, then you know it will be 20*5 = 100 ft below where it started the descent.
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To find the elevation of the submarine after 5 minutes, we can multiply the descent rate of 20 feet per minute by the number of minutes. In this case, we want to find the elevation after 5 minutes, so we multiply 20 feet by 5 minutes.
20 feet/minute * 5 minutes = 100 feet
Therefore, the submarine is at an elevation of 100 feet after 5 minutes.