Usually none. A function can be identified as f but it is more often denoted by f(x) to show that it is a function of x.
8
Absolute value of 13 is 13.
20
-629
Absolute value of -6+5 is 1.
Absolute value of -2+(-5) is 7.
3
The absolute value of an integer is found by ignoring its sign (plus or minus).
Find the absolute value of -3 plus the opposite of -3?
+sqrt(5)
4
In mathematics, the absolute value of a given number is the positive form of the number, for example, if the answer to a problem turns out to be plus or minus 3, then the absolute value is 3.