Can someone please help? This is the last question on my final.

What is the probability of rolling a single die greater than 4

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

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?