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The length of a rectangle is increasing at a rate of 8cm/s

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The length of a rectangle is increasing at a rate of 8cm/s and its width is increasing at a rate of 3 cm/s.  When the length is 20 cm and the width is 10 cm, how fast is the area of the rectangle increasing?
asked Nov 14, 2013 in Calculus by anonymous
   

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