Answer:
A. Count by hand.
B. Divide 20 by 2.
Step-by-step explanation:
The midpoint between two points is found by the mean of their coordinates.
Endpoints at (0,0) and (20,0)
So we have x coordinates of 0 and 20. Their mean is:
[tex]\frac{20 - 0}{2} = 10[/tex]
So we can find both counting by hand, or dividing 20 by 2.