calculs 3

Note: please write down the Answer by hand on paper and also write each answer with the number of the questions

9. A surfboard company has developed the yearly profit equation P(x, y) = -22x2 + 22xy - lly + 110x -44y - 23, where x is the number (in thousands) of standard surfboards produced per year, y is the number (in thousands) of competition surfboards per year, and P is the profit (in thousands of dollars). How many of each type board should be produced per year to realize a maximum profit? What is the maximum profit