The fear of the number 13 is called triskaedekaphobia, deriving from the Greek words Romanized as "triskaedeka" (13) and "phobia" (fear).
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That would be an addition problem such as 2+3=5 5 would be the sum.
The sum of a single number is the number itself. But usually the word "sum" is used for adding more than just one number.
The sum of a number plus 3 to the square root of 9 to the sum of 2 would equal -2. This is a math problem.
Let's call the number XTwice the number would be 2XFour times the same number would be 4XThe sum of these two is 2X + 4X = 6XThe answer is therefore six times the number.
No, it is a small positive number: 0.00072