To determine how much Amanda will make if she babysits for eight hours, you'll need to reference the graph mentioned in the question. Since I cannot see the graph, I suggest looking at the graph to find the value associated with 8 hours of babysitting.
If the graph indicates a certain amount for 8 hours, that will be your answer. Typically, the amount paid per hour is shown on the graph, so multiplying the hourly rate by 8 hours will give you the total amount Amanda makes.
If you can provide the values from the graph or the general trend it shows, I can help you make the prediction!