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5. (6 points) Oil is leaking onto the sidewalk, making a circular puddle. If the area of the circular puddle is increasing by a rate

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5. (6 points) Oil is leaking onto the sidewalk, making a circular puddle. If the area of the circular puddle is increasing by a rate of 4 square feet per minute, find the rate of change of the radius of the circle when the radius is 5 feet. (Relevant fact: The area of a circle with radius r is given by A = 172.)

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