Which input value produces the same output value for the two functions?

Which expression is not a polynomial?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

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?