Type the integers that makes the following addition sentence true + (-11) + 12=-16

What two criteria are needed for triangles to be similar

Need on this geometry question. explain how you did it.

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?