It is: 5+13+18 = 36
(13+5)18=13+(5+18)
5 + -13 + 18 = 5 - 13 + 18 = 10
-2 + 18 + -5 = 11
8 + 1 = 9 5 + 4 = 9 9 + 9 = 18 ( 8 + 1 + 5 + 4 = 18) The answer is 18.
13 plus -8 = 5 ... and -18 plus -2 = -20.
It is: 5/18 plus 4/9 = 13/18
611
-5+7--4+12 = 18
35.4
18(7) + 5 = 131
5/18 + -1/6 = 5/18 - 3/18 = 2/18 = 1/9