You can find the distance between two points on a number line by using the pythagorean theorem.

The distance formula is based on the Pythagorean Theorem. When you have 2 points the distance is the hypotenuse of a right triangle.  So the change in x and the change in y form the legs, thus Pythagorean Theorem can solve for the distance

Idon’t actually know but have you asked google yet

That. you would have multiple