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
If you mean 2/5 plus 1/4 then it is 13/20
91
-1
1+12=13+15=28+2=30+29=59.
98
-1 + 13 = 12
26
if u mean +13 - (+8) = 5, then yes
8 + 16 - 8 + 4 + 13 = -1
13+13+13+13+13+13+13+13+13+13 = 13 * 10 = 130.
13 - 15 - 1 + 11 = 8
91
-11x + 13
1/2 + 1/12 is 7/12
18 + 13= 31
-13