Solve the problem.The rate at which an assembly line worker's efficiency E (expressed as a percent) changes with respect to time t is given by  where t is the number of hours since the worker's shift began. Assuming that  find E(t).

A. E(t) = 70t - 2t2 + 20
B. E(t) = 70t - 2t2 + 156
C. E(t) = 70t - 2t2 + 88
D. E(t) = 70t - 4t2 + 20


Answer: A

Mathematics

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