It is 20 - (-4) = 20 + 4 = 24
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40
18 units ■
10
-16
The distance between two numbers on a number line is calculated by taking the absolute difference between the two numbers. In this case, the absolute difference between 15 and 64 is |15 - 64| = 49. Therefore, the distance between 15 and 64 is 49 units.