- Using partial differential equation to find fx,fy,a2u/axay x^2+y^2+e^xy=0?

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Math need help solving it please help.? Mrs. Jones Cookies Store sells cookies for 85 cents apiece. How many cookies did they sell if their revenue was $4250.? Reverse the order of integration and then evaluate the integral
∫ (125 to 0) ∫ (5 to 3) 1/y^4 + 1 dy dx? Can anyone help to solve this? What step is missing in the equation?