Which sum does the model below represent?
+
+
+
+
ĐO
oo ooo
0 4+(-7) = -3
O 4+ 7 = 11
O 8+(-3) = 4
O 11+ (-4) = -3

Which sum does the model below represent ĐO oo ooo 0 47 3 O 4 7 11 O 83 4 O 11 4 3 class=