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OpenStudy (anonymous):
The length "l" of a rectangle is decreasing at the rate of 2 cm/sec while the width "w" is increasing at the rate of 2 cm/sec. When l=12cm and w=5cm, find the rate of change of the area. :(
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OpenStudy (anonymous):
Oh, and the back of the book says the answer is 14 cm^2/sec, I just don't know how it was worked out.
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