The rate at which an assembly line worker's efficiency E (expressed as a percent) changes with respect to time t is given by E'(t) = 75 6t, where t is the number of hours since the worker's shift began. Assuming that E(l) = 92, find E(t) = 75t - E(t) = 75t- E(t) = 75t - E(t) = 75t - 3t2 + 164 3t + 92 3t2 + 20 6t2 + 20