Answer:
3
Explanation:
We can see that the graph is constant.=> the path of the dot/ the pattern is constant or not changing.
The balance was 18 when there were no visits.
It was 0 after 6 visits.
=>the amount spent on each visit is
Balance/number of visits= 18/6= $3
This can clearly be seen on the graph.
It may not work with a graph where the patter is not constant/ keeps on changing.