When sally went bowling her scores were 108, 72, and 95. if she bowls her 4th game, what will her score need to be to give her an average of 91?

Can someone me do math because i am having a breakdown rn because i don’t get it

Find all solutions for 2y - 4x =2 y = 2x + 1 site: socratic.org

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?