If I am correct, 9 plus 7 equals 112.
-7 + 11 = +4
3
A turn-around fact
9 plus 7 equals 144. Generally, x plus y = x(x+y).
4 plus 3 equals 7
-7 + 4 = -3
144
144 9+7 = 16 and 9*16 = 144
If I am correct, 9 plus 7 equals 112.
89
4+78=82-7=75
If x=4 then 2x+7 =
20
It's 21.
7-4-4+7
Commutative property of addition. :)