How fast in square feet per second is the area increasing

Reference no: EM13199009

The length of a rectangle is increasing at a rate of 2 ft. per second, while the width is increasing at a rate of 1 ft. per second. When the length is 4 ft. and the width is 5 ft., how fast, in square feet per second, is the area increasing?

Reference no: EM13199009

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