Solve the problem.
Business The commodity market is very unstable; money can be made or lost quickly when investing in soybeans, wheat, pork bellies, and the like. Suppose that an investor kept track of her total profit P (measured in thousands of dollars) at time t; measured in months, after she began investing and found that P = −3t2 + 18t − 15. At what time is her profit largest? (Hint: t > 0 in this case.)
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