This document contains a series of numbers and letters arranged in a graphical format with some numbers assigned to the variables x. It shows the values 7 assigned to x in several locations and the value -3 assigned to x in one location. The document also includes four line items labeled 1 through 4 at the bottom.

1. 74
106
37
144 18 36 72 53
30
60
60
30
K J
H I
x=7
x=7
x=6 x = ­3
1

2. 2

3. 3

4. 4