Question

the midpoint of the line joining point C (-11,6) and D (5,-14 is..

Answer 1

Here is your answer
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Answer 2

Let P be the mid point. 
P(x,y) =(x1+x2)/2 , (y1+y2)/2
P(x,y) = (-11+5)/2 , (6-14)/2
P(x,y) = (-6)/2 , (-8)/2
P(x,y) = (-3 , -4)