On a number line, what is the distance between −17 and 9?

We can start by finding the absolute value of both numbers and then subtracting them:

|−17| = 17

|9| = 9

So the distance between −17 and 9 is:

|−17 − 9| = |-26| = 26

Therefore, the distance between −17 and 9 on the number line is 26 units.