1. 2 + 5 = 5 + 2 exexmolifies which property?
2. 2*(7*5) = (2*7) * 5 exemplifies which property?
3. 2(x + y) = 2x + 2y exeemplifies whcih property?
4. 2z + 0 = 2z exemplifies which property?
5. 14*1 = 14 exempifies which property?
6. 13 + -13 = 0 exempifies which property?
7. 5* 1/5 = 1 ememplifies which property?
8. Simplify 18a + 31b + 14a - 2b
9. Simplify 14x - 2y + 21x + 7y
10. Simplify 15r + 7s + 9r - 7s