what property are these
1. 6+0=6
2. 4+(-4)=0
3. 9 (1)=9
4.(7+6) + 2 = 7+(6+2)
5. a+5 = 5+a
6. 6(7+2)= 6(7)+6(2)
7. 3(2+8)=(2+8)3
8.(-83+ 61)+3=-19
9. 7(9-6)= 7(9)-7(6)
10. (-512) (1)=-512​