If the order matters it is a permutation. For example: if you are selecting 3 people to be on a committee it doesn't matter what order you select them, but if you're selecting three people to be president, vice president, and secretary the order in which you choose them matters the first person being president, the second person being vice president, and the third person be secretary
1 hr=650
5x650=3250 calories in one week
36a+16b. The greatest common factor is 4
= 4(9a+4b)
