Lucy spokes lives exactly 0.80 km from school. One day, she discovers that the wheels of her bicycle turn exactly 280 times she rides from her house to the school. Determine the radius of her bike wheel. Round your final answer to the nearest centimeter.

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.