In how many ways can you arrange 3 out of 5 books (a, b, c, d, and e. on a shelf, if the order of each arrangement matters (so abc is different from cba)?

Which represents the solution set of the inequality 5x-9 < 21? a. x < 12/5 b. x > 12/5 c. x > 6 d. x < 6

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0