-15 + (-13) = -15-13 = -28
15 + 13 = 28
28
The answer is 270. Simply add up all of the numbers arithmetically like you would for two plus two. To make sure the answer is correct, check your work using a calculator.
15 + 13 + 11 = 39
17 plus 15 plus 13 equals 45.
It is: 13/15 plus 1/13 = 184/195
13 + 15 = 28
15+6 is 21. 13 + what is 21? 21 - 13 is 8 Eight
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
13
13 + 2 = 15
-2 + 15 = 13
-15
-15