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A worker starting his shift at 7:00 AM will have produced Q(t)= -t^3+6*t^2+15*t units t hours...

A worker starting his shift at 7:00 AM will have produced Q(t)= -t^3+6*t^2+15*t units t hours later. At what time is the worker's rate of production maximized?

a. 8 AM
b. 9 AM

c. 10 AM

d. 11 AM

Math   Precalculus   
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