What is the midpoint of AB?
G
H
I
B
+
-9
A
+ +
-8 -7 -6
+
-5
F
+ +
-4 -3
+ +
-2 -1
+
0
1
2
3
+
4
+
5
+
6
+
7
8
9
Opoint F
O point
point H
Opoint
