Multiple choice questions. Grade ten

What is the distance between point a and b

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12