Question: I am having a hard time answering this question... The area of a healing wound is given by A = 775. The radius is decreasing

I am having a hard time answering this question...

The area of a healing wound is given by A = 775. The radius is decreasing at the rate of 3 millimeter per day at the moment when r = 40. How fast is the area decreasing at that moment? Select an answer > Next
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