Question: A coal-burning electrical generating plant emits sulfur dioxide into the surrounding air. The concentration C(x), in parts per million, is given approximately by C(x) =

A coal-burning electrical generating plant emits sulfur dioxide into the surrounding air. The concentration C(x), in parts per million, is given approximately by
C(x) = 0.1/x2
where x is the distance from the plant in miles. Find the instantaneous rate of change of concentration at
(A) x = 1 mile
(B) x = 2 miles

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