2, 6, 10
Explanation:
Tom = s
Nancy = r
s=r-2 = Tom=Nancy-2
This means that Tom has $2 less than Nancy as they stayed in the information they gave us. They want us to complete the graph.
Since Tom has $2 less than Nancy all we have to do is apply rule -2 to each number.
4-2=2
8-2=6
12-2=10
Therefore the numbers to add to the graph are 2, 6, and 10.