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The total revenue​ (in hundreds of​ dollars) from the sale of x spas and y solar...

The total revenue​ (in hundreds of​ dollars) from the sale of x spas and y solar heaters is approximated by

R(x,y) = 11+196x+218y−8x^2−7y^2−4xy.

Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue.

Find the derivatives Rxx​, Ryy​, and Rxy.

Rxx=​____

Ryy=​____

Rxy=____

Selling spas _____ and _____solar heaters gives the maximum revenue of $_____.

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