You select value of n so that n-15 is a whole number.
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15 is the nearest whole number
Suppose q is a rational number. Then if q >= 0 then abs(q) = q.If q < 0 then abs(q) = -q [which is positive].
It is both.
The absolute value of 15 is 15. The absolute value of any positive number is the number itself. The absolute value of any negative number is the number times -1. For example: What is the absolute value of 10? Answer: 10. Example #2: What is the absolute value of -2? Answer: 2.