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an efficiency study of the morning shift (from 8am to 12:00 noon) at a certain factory indicates that an average worker who arrives on the job at 8:00am will have produced Q unitst hours later, where q(t)= -t^3+9/2t^2+15t.

A. WHat time during the morning is the worker performing most efficiently?

b. AT what time during the morning si the worker performing least efficiently

 

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