Michael and Shelley each evaluated the same expression. Who is correct? How do you know?

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

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?

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74