Question 411012
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Hi
Midpoint Pt(x,y): ( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2}}}) 
  (0 + x)/2 = -4; x = -8  and y = (0 + y)/2 = 10;  y = 20
 Other Endpoint is Pt(-8,20)