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8-9. A stone is dropped into Sherando Lake, causing circular ripples whose radii increase by 2 meters/second. How fast is the disturbed area growing when

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8-9. A stone is dropped into Sherando Lake, causing circular ripples whose radii increase by 2 meters/second. How fast is the disturbed area growing when the outer ripple has radius 5 meters (Problem #8)? How fast is the radius increasing at that moment (Problem #9)? Answers should be expressed in terms of square meters per second (#8) and meters per second (#9)

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