Beverly Hibbs earns $683.00 a week. She is single and claims 2allowances. What amount is withheld weekly for federal income tax?

Can someone me with my hwplz(only the circled ones)

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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?