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The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x,y) = 14 + 441x

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The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x,y) = 14 + 441x + 420y - 9x2- 8y- 15xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue. Find the derivatives Rxx, Ry, and Rxy Rxx = , Ryy = [, Rxy = 0 Selling spas and solar heaters gives the maximum revenue of $ (Simplify your answers.)

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