WORKER EFFICIENCY An efficiency study of the morning shift (from 8:00 a.m. to 12:00 noon) at a certain factory indicates that an average worker who arrives on the job at 8:00 a.m. will have assembled Q(t)= − t3+ 6t2+ 15t units t hours later.
a. At what time during the morning is the worker performing most efficiently?
b. At what time during the morning is the worker performing least efficiently?
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