Madison's skateboard cost 10% more than tony's skateboard. madison's skateboard cost $83. b. write an equation that could be used to find the cost of tony's skateboard.

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?