Jon recently drove to visit his parents who live 480 miles away. on his way there his average speed was 20 miles per hour faster than on his way home (he ran into some bad weather). if jon spent a total of 20 hours driving, find the two rates, variable is s.

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.