Answer with explanation:
It is given that , points , A, B , C and D lie on a line such that,
AB=BC=CD=6 inches
Draw a number line, such that, coordinate of
A=0, B=6, C=12, D=18.
It is given that, mid points of AB and CD is M and N , respectively.
Mid point of AB, which is M
[tex]=\frac{0+6}{2}\\\\=3[/tex]
Mid Point of CD, which is N
[tex]=\frac{12+18}{2}\\\\=15[/tex]
So, MN=15-3
=12 inches
