Question

C(4, 0) and D(2, 8) are the endpoints of a line segment. What is the midpoint M of that line segment?

Answer 1

its the average of the end points: (C+D)/2

Answer 2

for two endpoints \[(x _{1},y _{1}) and (x _{2},y _{2})\]
to find the midpoint M,
\[M(\frac{ x _{1},+x _{2} }{ 2 },\frac{ y _{1}+y _{2} }{ 2 })\]