To determine the distance between two points on a number line, you can subtract one value from the other and take the absolute value of the result.
Distance = |6.5 - (-7.2)|
Calculating this gives:
Distance = |6.5 + 7.2|
Distance = |13.7|
Distance = 13.7
Thus, the distance between 6.5 and -7.2 on a number line is 13.7.