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Question

A scuba diver dove from the surface of the ocean to an elevation of −79 feet at a rate of −18.8 feet per minute. After spending 15 minutes at that elevation, the diver ascended to an elevation of −8 feet. The total time for the dive so far was 22minutes. What was the rate of change in the diver's elevation during the ascent? Round your answer to the nearest hundredth.

Answer 1

The endpoints of the ascending interval are (15 min, -79 ft) and (22 min, -8 ft) where the x coordinate is time in minutes and y is the diver's depth. The average rate of change in elevation during the ascent is the slope of the secant line connecting the two endpoints:

Average Rate of Change = (-8 - (-79))/(22 - 15) = ______ ft/min.

Use your calculator to get the answer. Round to the nearest hundredth as instructed.