The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x,y) = 16+ 329x+275y-8x²-6y²-11xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue. Find the derivatives R, Ry, and Ry Rxx = Ry=Rxy = 0

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