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thank you. When a circular plate of metal is heated in an oven, its radius increases at a rate of 0.03 cm / min. At

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thank you.

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When a circular plate of metal is heated in an oven, its radius increases at a rate of 0.03 cm / min. At what rate is the plate's area increasing when the radius is 42 cm? The rate of change of the area is cm min. (Type an exact answer in terms of J.)

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