A B C D E
<---------.-------------.------.----.--.------->
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5
Which point is the midpoint of segment AD?
b. What is the length of segment AB?
c. Name another segment with the same length at segment
(a) (A+D)/2
(b) B-A
(c) no idea, but do some subtractions to find a pair with the same result