A submarine descends below the ocean's surface at a of rate 75 feet per minute. How many feet below the ocean's surface will the submarine be in 12 minutes?

Answer 1

The submarine would be 900 below the ocean surface after 12 minutes assuming it started its descent at the surface of the ocean.

The following formula can be used to calculate the distance traveled over time—that is, the distance a submarine descends.

#d = r*t# where #d# is the distance traveled (or descended), #r# is the rate of travel and #t# is the time.

In this problem we are told the rate, #r# is 75 feet per minute. And, we are told the time, #t#, to calculate for which is 12 minutes.

Adding these to the formula and computing the result yields:

#d = (75feet)/(min) * 12 min#

#d = (75feet)/(cancel(min)) * 12 cancel(min)#

#d = 75feet * 12#

#d = 900 feet#

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Answer 2

Eva Abramson

The submarine will be 900 feet below the ocean's surface in 12 minutes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.