Solve the problem.A company estimates that it will sell N(t) hair dryers after spending $t thousands on advertising as given by: N(t) = -3t3 + 450t2 - 21,600t + 1,100,40 ? t ? 60For which values of t is the rate of sales N'(t) increasing?
A. 50 < t < 60
B. t > 40
C. 40 < t < 60
D. 40 < t < 50
Answer: D
Mathematics
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