Find all possible values of the digits Y, E, A, R if - EEE + AA - R = 1234, and different letters represent different digits.

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?

How do i simply this radical expression?

Multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2