Read Appendix B and Sections 2.1, 2.2

p. 522 # 1, 2, 3; (in #3 express your answer as a product of integers - preferably primes.)

p. 13 # 2, 4, 5, 8, 21;   Extra Credit: p. 13 # 25, 26

p. 24 # 1, 5, 6;   Extra Credit: p. 24 # 8, 14

For one of these questions you will need to know that if a,b are integers and p is a prime, p|ab implies p|a or p|b.