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The length x, of a rectangle is decreasing at the rate of 5 cm/minute and the width y, is increasing at the rate of 4 cm/minute. When x = 8 cm and y = 6 cm, find the rate of change of the area of the rectangle.

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Given,

dx/dt = -5 cm/m,

dy/dt = 4 cm/m

A = x * y

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