Factor the expression: -5b - 25

Evaluate the expression. (9 + 5)(3 + 2)0

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

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?