4) Suppose that x thousand units of a product will be sold when the price is p(x) = -2x + 31 dollars per unit and that the cost of producing x thousand units is C(x) = 7x +5 thousand dollars. (a) Express the profit P(x) obtained from the sale of x thousand units as a function of x. (b) What level of production results in a maximum profit? (c) What is the maximum profit obtained?

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Q: ve maximum or

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