9 A scuba diver dove from the surface of the ocean to an elevation of -79-
feet at a rate of -16 feet per
10
9
minute. After spending 15 minutes at that elevation, the diver ascended to an elevation of -8- feet. The
10
1
total time for the dive so far was 22 minutes. What was the rate of change in the diver's elevation during
the ascent? Round your answer to the nearest hundredth.
22