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OpenStudy (anonymous):
The length of a rectangle is increasing at a rate of 8 cm/s and its width is increasing at a rate of 3 cm/s. When the length is 20 cm and the width is 10cm, how fast is the are of the rectangle increasing?
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OpenStudy (turingtest):
\[A=Lw\]product rule: \[dA/dt=(dL/dt)w+(dw/dt)L\]Plug in the numbers and solve!
OpenStudy (anonymous):
perfect, thanks!!!
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