Which set of ordered pairs represents a function?

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

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8