During an 8-hour shift, the rate of change of productivity (in units per hour) of infant activity

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During an 8-hour shift, the rate of change of productivity (in units per hour) of infant activity centers assembled after t hours on the job is
128(t + 6t) r(t) (t2 + 6t + 18)? ’ 0st<8
lim r(t).

(c) Is the rate of productivity higher near the lunch break (at t = 4) or near quitting time (at t = 8)?

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