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A big block of ice is in the shape of a perfect cube. As it melts, each edge of the cube is decreasing at

A big block of ice is in the shape of a perfect cube. As it melts, each edge of the cube is decreasing at the rate of 2 cm/min. At what rate is the ice cube's a.) surface area changing b.) volume changing when the edge of the ice cube is 80 cm. ?

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