Can someone show me how to do this or like just do a single problem for me to show me how to do it I don’t understand how to do the work but I know the answer please I need help it’s due tommarow

Step-by-step explanation:
The coordinates of the midpoint are the average of the endpoints.
40. Endpoint (-8, 11), and midpoint (-6, 9).
-6 = (x + -8) / 2
-12 = x − 8
x = -4
9 = (y + 11) / 2
18 = y + 11
y = 7
The other endpoint is at (-4, 7).