Solve the problem.Assume that the profit P made when t units are sold, t > 0, is given by P(t) = t2 - 18t + 72. For what values of t will there be a profit (that is, P > 0)?
A. t = 6 or t = 12
B. t = 18
C. 6 < t < 12
D. 0 < t < 6 or t > 12
Answer: D
Mathematics
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