1+12=13+15=28+2=30+29=59.
13 if you refer to a number line. If you subract you will get -1-12 = -13
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
The sum of integers from 1 to n is n/2 times (n + 1), in this case 7.5 x 16= 120
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300
It evaluates to: 12+(-1)+(-1)+3 = 13
26
-1 + 13 = 12
13+(-12) = 1
1+12=13+15=28+2=30+29=59.
1/2 + 1/12 is 7/12
8 plus 1 times 12 minus 13 is equal to seven.
A bakers dozen. 12+1=13
3/4 plus 1/3 = 13/12 or 1 and 1/12
5/12 plus 1/8 = 13/24
13
It is: 3/4 plus 3/9 = 13/12 or 1 and 1/12