Which property of whole-number addition is demonstrated in each equation? a.
1 0=1
. b.
4 6=6 4
. c.
8 7=15inW
. d.
(4 3) 7=(3 4) 7
. e.
(6 3) 9=6 (3 9)
. f.
(9 4) (7 3)=(7 3) (9 4)
.
