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A scuba diver dove from the surface of the ocean to an elevation of -79 9/10 feet at a rate of -18.8 feet per minute. After spending 12.75 minutes at that elevation, the diver ascended to an elevation of -28 9/10 feet. The total time for the dive so far was 19 1/8 minutes. What was the rate of change in the diver's elevation during the ascent? why descent time is 4.25

  • math -

    (-28.9-(-79.9))/(19.125-12.75-(79.9/18.8)) = 24.0 ft/min

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