Assume that x and y are both differentiable functions of t and find the required values of dy/ dt and dx/ dt.
(a) Find dy/ dt, when x = 16, given that dx/ dt = 4.
(b) r = 25 inches.
Find the open intervals on which the function is increasing or decreasing. Use a graphing utility to verify your results. (Enter your answer using interval notation. If an answer does not exist, enter DNE.)
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