Solve the problem.P(x) = -x3 + 12x2 - 21x + 100, x ? 4 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. Find the number of hundred thousands of tires that must be sold to maximize profit.
A. 13 hundred thousand
B. 4 hundred thousand
C. 7 hundred thousand
D. 10 hundred thousand
Answer: C
Mathematics
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