A deep-sea exploring ship is pulling up a diver at the rate of 25 feet per minute The diver is 200 feet below sea level. How deep was the diver 10 minutes ago?

Answer 1

Ten minutes ago, the diver was #450# feet below sea level.

Since tge diver is being pulled up, measuring his movement for the past #10# minutes requires that we use #-25# for the movement over those #10# minutes. So, his depth #10# minutes ago is given by the expression

#-200 - 25(10)# #-200 - 250# #-450#

So, #10# minutes ago, the diver was #450# feet below sea level.

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Answer 2

Julia Adams

The diver was 450 feet below sea level 10 minutes ago.

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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.