3/4+4y÷3;y=1 1/22 please help

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

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Need on this geometry question. explain how you did it.