The line is stretched from M to P
The point O is in between M and P, so the length OM add length OP will give the full length of MP
OM = [tex]34z[/tex]
OP = [tex]36z-7[/tex]
The length MP = OM + OP = [tex]34z+36z-7=70z-7[/tex]
If N is the midpoint of MP, then the length MN is half of the length MP
MN = [tex] \frac{70z-7}{2} [/tex]
