4) what is the next number?
0 3 8 15 24 35

Nine more than four times a number is the same as one less than twice the number. find the number?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

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?