For any set a phi times a = phi why is this true/false?

Assemble the proof by dragging tiles to the statements and reasons column

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?