What fraction goes in the box to make it correct?

What properties allow transformation to be used as a problem solving tool

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

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?