Answer:
Option D. Divide 15 by 2
Explanation:
we know that
To find the y-coordinate of the midpoint of a vertical line, adds the y-coordinates of the endpoints and divide by two
we have the endpoints
(0,0) and (0,15)
The y-coordinate of the midpoint is (0+15)/2=15/2=7.5
therefore
Divide 15 by 2