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17 July, 01:38

Profit is the difference between revenue and cost. The revenue, in dollars, of a company that makes skateboards can be modeled by the polynomial 2x3 + 30x - 130. The cost, in dollars, of producing the skateboards can be modeled by 2x3 - 3x - 520. The variable x represents the number of skateboards sold.

What expression represents the profit?

27x - 650

27x + 390

33x - 650

33x + 390

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  1. 17 July, 04:44
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    The answer is 33x + 390. Profit is the difference between revenue and cost: P (x) = R (x) - C (x). The revenue is: R (x) = 2x^3 + 30x - 130. The cost is: C (x) = 2x^3 - 3x - 520. Thus, the profit is: P (x) = 2x^3 + 30x - 130 - (2x^3 - 3x - 520) = 2x^3 + 30x - 130 - 2x^3 + 3x + 520 = (2x^3 - 2x^3) + (30x + 3x) + (520 - 130) = 0 + 33x + 390 = 33x + 390.
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