12/10+2=12
4+8 =12
17
8
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1
-6
The sum of 8/9 and 4/7 is 1 29/63.
-4 minus 8 plus 5 is equal to -7
-4
The sum of 8 and -12 is -4.
The sum of 3/8 and 1/4 is 5/8.
The sum of 1/8 and 3/4 is 7/8.
- 12 + 4 = - 8