Dan and Barney are members of different video game libraries. Dan pays a membership fee of $35, and he pays $4 for every video game he rents. The following function shows the total amount of money, y, in dollars, that Barney pays for renting x number of video games: y = 3x + 30.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?