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OpenStudy (anonymous):
As the zoom lens in a camera moves in and out the size of the rectangular image changes. Assume that the current image is 4cm * 2cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.6cm/s and the width of the image is changing at 0.3 cm/s
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OpenStudy (anonymous):
A = w * L dA = w' L + w L' = .3 * 4 + 2*.6 = 2.4 cm²/sec
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