Answer: Option B.
Step-by-step explanation:
You need to remember that the y-coordinate of the midpoint is the average of the y-coordinate of the two points:
[tex]\frac{y_1+y_2}{2}[/tex]
Given the endpoints (0,0) and (0,15) of the line segment, you can identify that the y-coordinate of each one are:
[tex]y_1=0\\y_2=15[/tex]
Then, when you substitute them into [tex]\frac{y_1+y_2}{2}[/tex], you get:
[tex]=\frac{0+15}{2}=\frac{15}{2}=7.5[/tex]
Then, the method that you could use to calculate the y-coordinate of the midpoint of this vertical line segment is:
Divide 15 by 2.
