Mathematics, 27.10.2020 18:00 ladybugys

A scuba diver dove from the surface of the ocean to an elevation of -89 9/10 feet at a rate of -21.2 feet per minute. After spending 14 minutes at that elevation the driver ascended to an elevation of -38 9/10 feet. The total time of the five so far was 21 1/8 minutes. What was the rate of change in the divers elevation during ascent?

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A scuba diver dove from the surface of the ocean to an elevation of -89 9/10 feet at a rate of -21.2...