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Mathematics 18 Online
OpenStudy (anonymous):

A silk thread with a one-square-millimeter cross section is 36 inches long when there is no tension on it and its length increases by y(F) inches when it is stretched by a force of F pounds, where y(7)=3.6 inches and y'(7)=0.9 inches per pound. Use differentials to approximate how much the thread stretches when the force is 7.5 pounds.

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