5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 9 + 9 + 9 + 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 = 43
9*5=45 or 5+5+5+5+5+5+5+5+5=45 or1*5*9=45
-9
5x + 4 - 3x + 5 + 2x - 9 = 4x
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 45, the shorter version is 5*9.
9 + 9 + 9 + 1 + 6 + 5 = 39
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 9 + 9 + 9 + 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 = 43
Yes because they all add up to 18
3 + 5 + 9 + 5 + 5 + 5 + 5 + 6 + 4 = 37
9 + 6 + 9 + 6 + 9 + 8 + 5 + 2 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 99
5 +9 = 9 + 5 is an example of arithmetic commutativity
9*5=45 or 5+5+5+5+5+5+5+5+5=45 or1*5*9=45
5 + 6 + 9 = 20
5+9+1 = 15
44 - 9 + 6 + 5 + 4 + 32 + 5 = 87
It is: -5+1+8+5 = 9
2 + 5 + 9 + 99 = 115