how far apart are they?

how far apart are they?
Answer
Explanation:
Step1: Identify the two - point values
The two points are at 6 and 15 on the number - line.
Step2: Calculate the distance
Use the formula (d=\vert x_2 - x_1\vert), here (x_1 = 6) and (x_2=15), so (d = 15 - 6). (15-6 = 9)
Answer:
9