The total revenue​ (in hundreds of​ dollars) from the sale of x spas and y solar heaters is approximated by R(x,y)=14+400x+278y−8x2−4y2−10xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue.   Find the derivatives Rxx​ = ? Ryy​ = ? Rxy = ?     Selling ? spas and ? solar heaters gives the maximum revenue of ​$ ?.

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