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3. The total prot (in thousands of dollars) from the sale of x hundred thousand automobile tires is approximated by P(x) = x3 + 9x2 + 1203: 400, x 2 5. 3) Find the number of hundred thousands of tires that must be sold to maximize prot. b) What is the maximum prot? lof4 4. A television manufacturing rm needs to design an open-topped box with a square base. The box must hold 32 in3. Find the dimensions of the box that can be built with the minimum amount of materials