Rita is a postal clerk She comes to work at 6 A M and t hours later has sorted approximately f (t) t 3 7t 2 200t letters At what time during the period from 6 A M to 10 A M is Rita performing at peak efficiency

Question: Rita is a postal clerk. She comes to work at 6 A.M. and t hours later has sorted approximately f (t) = t 3 +

Rita is a postal clerk. She comes to work at 6 A.M. and t hours later has sorted approximately f (t) = −t³ + 7t² + 200t letters. At what time during the period from 6 A.M. to 10 A.M. is Rita performing at peak efficiency?

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