Answer:
(-2,5)
Step-by-step explanation:
use formula: m= (
)
midpoint(m) equals (4,0) and C is (10,-5)
C represents
and other endpoint D represents
so:
(4,0) =
4 = 
Get rid of 2 by multiplying both sides by 2
8 =
Subtract both sides by 10
x coordinate of D = -2
To find y coordinate of D:
0 =
Get rid of 2 by multiply both sides by 2
0 =
Add both sides by 5
y coordinate of D = 5
So if x-coordinate of D= -2 and y-coordinate of D=5, the coordinates for D is (-2,5)