An eighth-grade student claims she can prove that subtraction of integers is commutative. she points out that if a and b are integers, then

a - b = a + (-b)

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.

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?

What are the factors of me - 12m + 20?