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Mathematics 9 Online
OpenStudy (anonymous):

a geologist determines that the age ( in years) of a certain layer of rock is given by the function A(x)= integral from 0 to 2x of 3 sqrt(45+s^2) ds, where x is the depth (in meters) at which the layer occurs. Find the rate of change of the age A with respect to the depth at a depth of 3 meters.

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