Please help! x^3 +y^3=9

Step-by-step explanation:

Taking the derivative of both sides with respect to x, we get

Solving for , we get

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540