To find the distance between two numbers on a number line, you can subtract one number from the other and take the absolute value of the result.
Here, the two numbers are 18.25 and -7.4.
The distance \( d \) can be calculated as follows:
\[ d = |18.25 - (-7.4)| = |18.25 + 7.4| = |25.65| = 25.65 \]
So, the distance between 18.25 and -7.4 is 25.65.