18. The radius of a circle increases at a rate of 2 m/sec. Find the rate...

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18. The radius of a circle increases at a rate of 2 m/sec. Find the rate at which the area of the circle increases when the radius is 5 m. f(x) = x-6x 6 f(x) { x - e if a 0, 2 < x-1 if x > O' at x = 0 18. The radius of a circle increases at a rate of 2 m/sec. Find the rate at which the area of the circle increases when the radius is 5 m. f(x) = x-6x 6 f(x) { x - e if a 0, 2 < x-1 if x > O' at x = 0