Which number is missing in the last step? the first few steps in solving the quadratic equation 8x2 + 80x = -5 by completing the square are shown 8x2 + 80x = -5 8(x2 + 10x) = -5 8(x2 + 10x + 25) = -5+ 0 -200 0 -25 0 25 0 200

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?