10.4 = 10 and 2/5 in its simplest form
104/25 = 44/25
104 is already expressed as a whole number
It is 104/125
14
About 1 and 23/25
104 and 2/7
54/5 = 104/5
If you mean: 10/4 then it is 2 and a 1/2
104/15 simplifies as a mixed number to 614/15
No, because then it would not be a mixed number.
A number example of a mixed number would be 1 1/2. You have a whole number, followed by a fraction
Whenever you minus a negative (number), you add. So it would be 104 - (-13), or 104 + 13, which is 117