If your playing 4 4s, 4! x 4 + root4 + root 4
No.
No.
10
If you are thinking of a mgic square, the answer is NO. The nine numbers sum to 45 so if you have three rows with equal sums, that sum can only be 45/3 = 15. You can have two rows, each adding to 17, and using the digits only once, but you will not use all digits.
No. The sum of 1-9 is 45 and 12 does not divide 45.
The only sum of 14 can be 14.
Basically, it means to add the numbers in your head.
Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.
Yes.
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A single number can have only one sum: in this case, 57.
The answer will depend on what kind of sums.