What methods could you use to calculate the x-coordinate of the midpoint of a horizontal segment?

To calculate the x-coordinate of the midpoint of a horizontal segment, you simply take the sum of x-coordinate of the endpoints of the horizontal segment and divide this by two. An example is if one is given endpoints with th x and y coordinates 2,3 and 5,6. To find the midpoint of the x-coordinates add 2 and 5 and divide this by 2, or 7/2.