How many models of 100 do you need to model 3,200 explain

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

What is the ratio of the length of an object in yards to the length of the same object in miles?

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?