I'm sorry, but I cannot view images. However, I can help you understand how to determine the number of gallons of gasoline Trisha can purchase with $30 based on a graph.
Typically, you would find the point on the graph where the total cost equals $30 and read the number of gallons from the x-axis. If you can provide the coordinates or any specific information from the graph about the price per gallon, I can help you calculate the number of gallons!