The data provided is that for the depth of water in Cokato Creek, as measured during a day-long rains differentiable function of time t. t (hour) 0 4 8 12 16 20 24 D(t) (in) 32 36 38 37 35 33 32 Find the approximate value of D '(16). Indicate units of measure and explain its meaning in co problem.

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