What is the volume of this shape and how do i find 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?

Is the number 128.439 a rational number

Acircle has a diameter of 10 what is the area of the circle? use 3.14 for pi. round to the nearest hundredth