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The side length of a square is decreasing at a rate of 2 kilometers per hour. At a certain instant, the side length is 9

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The side length of a square is decreasing at a rate of 2 kilometers per hour. At a certain instant, the side length is 9 kilometers. What is the rate of change of the area of the square at that instant (in square kilometers per hour)? Choose 1 answer: A -81 B -36 C -4 D -324

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