The radius of a circular oil slick expands at a rate of 2 m/min. (a) How fast
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The radius of a circular oil slick expands at a rate of 2 m/min.
(a) How fast is the area of the oil slick increasing when the radius is 25 m?
(b) If the radius is 0 at time t = 0, how fast is the area increasing after 3 min?
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