Answer: 9 units
Step-by-step explanation:
|9| is the absolute value of +9 wich is also positive 9.
The definition of the absolute value is that the absolute value of a number is the distance from them to the 0 on the number line. Thus the distance here is 9.
In a number line we can represent this numbers to see this better:
as we can see to go from 0 to 9 we have to move 9 steps or units. This is the distance between the numbers 0 and |9|.