The financial department for the company in Problems 88 and 90 established the following cost function for producing and selling x thousand notebook computers:
C(x) = 4,000 + 500x thousand dollars
(A) Write a profit function for producing and selling x thousand notebook computers and indicate its domain.
(B) Complete Table 13, computing profits to the nearest thousand dollars.

(C) Plot the points in part (B) and sketch a graph of the profit function using these points.

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Table 13 Profit r (Thousands) Plu) (Thousand S) -2,560 10 15 20 25