Comparing Relative Magnitudes (exponential growth,logarithmic growth, polynomial growth) - AP Calculus BC

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Question

A cylinder of height and radius is expanding. The radius increases at a rate of and its height increases at a rate of . What is the rate of growth of its surface area?

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Answer

The surface area of a cylinder is given by the formula:

To find the rate of growth over time, take the derivative of each side with respect to time:

Therefore, the rate of growth of surface area is:

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