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Efficiency of a machine operator. The rate at which a machine operator’s efficiency, E (expressed as a percentage), changes with respect to time t is given by
Where t is the number of hour the operator has been at work.
A machine operator’s efficiency changes with respect to time.
Find
Use the answer to part (a) to find the operator’s efficiency after 3 hr; after 5 hr.
With respect to time t is given by

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Calculus and Its Applications (11th Edition)
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