To determine the number of gallons of gasoline Trisha can purchase with $30, you would need to refer to the graph mentioned that shows the total cost based on the number of gallons. However, since I do not have access to that graph, I can explain how to read it:
- Locate the point on the graph that corresponds to a total cost of $30.
- From that point, move horizontally to find out how many gallons that cost corresponds to.
Once you find the intersection where the total cost is $30, you can read off the number of gallons directly from the graph.
If you provide the cost per gallon or the specific graph details, I can give you the exact number of gallons based on the information provided.