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Find the area of the shaded region. 8cm 8cm 4cm 4cm

Find the sum of the following series. round to the nearest hundredth if necessary.

4. find the geometric mean of 4 and 12. 24 8

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?