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A businessman models the number of items (in thousands) that his company sold from 1998 through 2004 as N (x) = -0.1 x 3 + x 2 - 3x + 4 and the average price per item (in dollars) as P (x) = 0.2x + 5, where x represents the number of years since 1998. Write a polynomial R(x) that can be used to model the total revenue for this company.