What is the effect on the graph of the function f(x) = IXI when f(x) is changed to f(x + 9)? A)
shifts right by 9 units
B)
shifts left by 9 units
C)
shifts up by 9 units
D)
shifts down by 9 units

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?