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# The cost, in millions of dollars, for a company to manufacture x thousand speed boats is given by the function C(x) = 3x2 - 30x + 225.

**The cost, in millions of dollars, for a company to manufacture x thousand speed boats is given by the function**

**C(x) = 3x2 - 30x + 225.**

**Find the number of speedboats that must be produced to minimize the cost.**

**To minimize the cost, the company must produce ____ thousand speedboats.**