Final answer:
To find the y-coordinate of the midpoint of a vertical line segment, you can divide the difference of the y-coordinates of the endpoints by 2.
Step-by-step explanation:
To calculate the y-coordinate of the midpoint of a vertical line segment with endpoints at (0,0) and (0,-15), you can use the method of dividing the difference of the y-coordinates of the endpoints by 2. In this case, the difference is -15 - 0 = -15, so dividing -15 by 2 gives us -7.5 as the y-coordinate of the midpoint.
Therefore, the correct methods to calculate the y-coordinate of the midpoint are:
- Divide 15 by 2.
- Add the endpoints.
Learn more about Midpoint of a Vertical Line Segment