To determine the distance between two points on a number line, you can subtract the smaller number from the larger number and take the absolute value of the result.
Here, we have the numbers \( -18.26 \) and \( -2.45 \).
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Subtract the smaller number from the larger number: \[ -2.45 - (-18.26) = -2.45 + 18.26 = 15.81 \]
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The distance is the absolute value, which is: \[ |15.81| = 15.81 \]
Thus, the distance between \( -18.26 \) and \( -2.45 \) is \( 15.81 \).
The correct response is: 15.81