Calc POD #38 Related Rates. A circle has an initial radius of 50 ft when the radius begins decre...

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Our first related rates problem! A circle has an initial radius of 50 ft when the radius begins decreasing at the rate of 2 ft/min. What is the rate in the change of area at the instant that the radius is 13 ft?
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please don't explain it like I simply was a pro and just forgot how to do it. more detail and accuracy.

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