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Verified Answer :

The coordinates of C must be (8,10).

If you plug in the values given in the midpoint formula
\(8= \frac{8+(8)}{2}\)
 
and \(15= \frac{20+(10)}{2}\)

it matches perfectly with the provided midpoint

The mid point is 5 away from d so it should be five away from c. 8,5