To determine the distance between two points on a number line, you can use the formula:
\[ \text{Distance} = |a - b| \]
where \( a \) and \( b \) are the two points. In this case, \( a = 6.5 \) and \( b = -7.2 \).
Calculating the distance:
\[ \text{Distance} = |6.5 - (-7.2)| = |6.5 + 7.2| = |13.7| \]
Thus, the distance between 6.5 and -7.2 is:
\[ \text{Distance} = 13.7 \]