25
Plus 12 plus -13 plus plus 1 can be rewritten in mathematical terms as: 12+(-13)+1 or 12-13+1 12-13+1 =-1+1 =0
17 + 13 + 12 + 12 + 6 + 9 = 69.
13 + 23 + 12 + 7 = 55
13 + 12 = 25
6
13 + 21 - 7 + 12 = 15
6 + 13 + 2 + 12 + 7 + 14 = 54
13 + 2*12 = 37.
The commutative property.
26
13 - 4 + 12 = 21
13 - 12 + 5 = 6