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OpenStudy (anonymous):
The length of a rectangle is increasing at a rate of 8cm/s and it width is increasing at a rate of 3cm/s. When the length is 20cm and the width is 10cm, how fast is the area of the rectangle increasing?
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OpenStudy (amistre64):
Whats the formula for area of a rectangle?
OpenStudy (amistre64):
A = lw ; then derive A' = l'w + lw' and fill in the parts
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