To find 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, \( a = 18.25 \) and \( b = -7.4 \).
Now, calculating the distance:
\[ \text{Distance} = |18.25 - (-7.4)| = |18.25 + 7.4| \]
Now, add the numbers:
\[ 18.25 + 7.4 = 25.65 \]
Thus, the distance is:
\[ \text{Distance} = |25.65| = 25.65 \]
So, the distance between 18.25 and -7.4 on the number line is \( 25.65 \).