The tiles on the left contain functions written using function notations. Match each function with its input

Answer:Part 1) h(g)=-4+g ----> the input is gPart 2) f(h)=-h-7 -----> the input is hPart 3) g(f)=-2f -----> the input is fStep-by-step explanation:Part 1) we haveh(g)=-4+gwe know thatThe input  is the independent variable and the output is the dependent variable sothe output is h(g) or 4+gthe input  is the variable gPart 2) we havef(h)=-h-7we know thatThe input  is the independent variable and the output is the dependent variable sothe output is f(h) or h-7the input  is the variable hPart 3) we haveg(f)=-2fwe know thatThe input  is the independent variable and the output is the dependent variable sothe output is g(f) or 2fthe input  is the variable f