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ANSWER
(5, -0.5)
EXPLANATION
If the segment is vertical, then the midpoint will have the same x-coordinate: 5. The y-coordinate is half the distance between the y-coordinates of the endpoints of the segment:
[tex]d=4-(-5)=4+5=9[/tex]The y-coordinate of the midpoint is:
[tex]4-\frac{d}{2}=4-\frac{9}{2}=4-4.5=-0.5[/tex]So the midpoint is (5, -0.5)