A coal-burning electrical generating plant emits sulfur dioxide into the surrounding air. The concentration C(a), in parts per

Question

A coal-burning electrical generating plant emits sulfur dioxide into the surrounding air. The concentration C(a), in parts per million, is approximately given by the function
where is the distance away from the plant in miles.
The instantaneous rate of change of the sulfur dioxide concentration:
(A) 4 miles from the plant =
(B) 8 miles from the plant =

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