Math is so easy I love it​

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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?