David is the groundkeeper at Triangle Park. An image of the shape of the park is shown below. a)David needs to cut the grass. How many square yards of grass will he cut altogether?

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?