19 + 23 + 518 = 560
The sum of 712 plus 518 is 1230
672.72 repeating
672.72 repeating
The sum of -80 and 77 is -3
-15.4
12 + 77 = 89
that's kinda general. it could be 518 and 1. are you sure its sum? or is it product?
If sum of digits of a number is divisible by 3 then the number is divisible by 3. Sum of digits = 5+1+8 = 14 and 14 is not divisible by 3. So 518 is not divisible by 3.
38 + 39 = 77
The difference between 400 and the sum of 821 and 77 can be calculated by first finding the sum of 821 and 77, which is 898. Then, subtract 898 from 400 to find the difference. Mathematically, this can be represented as 400 - (821 + 77) = 400 - 898 = -498. Therefore, the difference between 400 and the sum of 821 and 77 is -498.
99