The sum of 11 and 7 is 18.
The sum of 8, 11 and 9 is 28.
This question doesn't make sense. The sum of 11 and 60 is 71. The product of 11 and 60 is 660.
-11 + n
11 + k
The sum of 11 and 11 is 22.
The sum of addends 11 and 15 is: 11 + 15 = 26
The sum of 88 and 11 is 99.
The sum of 11 and 7 is 18.
The sum of 8, 11 and 9 is 28.
You remember that 'sum' means addition so that's b+11
11. Sum means to add 3+8=11
11
b+11
y + 11
11
The sum is: (11-2)*180 = 1620 degrees