SOMEBODY PLEASE ANSWER THIS FAST IM IN A PROGRESS CHECK

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

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?