A hobby store is having a promotion on picture frames: buy 3 get the 4th frames at 75% off. Write an expression to represent the total cost for 4 frames in two different ways.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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?