The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x,y) = 19 + 162x + 210y - 3x2 - 5y? - 6xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue. Find the derivatives Ryx, Ry, and Ryy- R = Rw = Ryy

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