What is the vertical change between the points (100, 5) and (1000, 5)?

zero.

To find the vertical change between two points, you need to subtract the y-coordinate (vertical coordinate) of the first point from the y-coordinate of the second point. In this case, the given points are (100, 5) and (1000, 5).

The y-coordinate of the first point is 5, and the y-coordinate of the second point is also 5. So, the vertical change between these two points is 0.