The coordinates of D is (-8 , -16 )
Coordinates are the location of a point on the x-y plane.
It is given that the coordinates of C are (4,4)
the midpoint of CD is at M(-2,-6)
The distance between D to the midpoint is equal to distance between C and the mid point M .
The distance between C and M is
( -2 - 4 , -6 -4 )
( -6 , -10)
Adding this to the mid point will give the location of D
(-2 -6 , -6 , -10 )
(-8 , -16 )
Therefore the coordinates of D is (-8 , -16 ).
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