To determine how many gallons of gasoline Trisha can purchase with the $30 she has, you would need to look at the graph you mention. The graph should typically show the total cost of gas as a function of the number of gallons purchased.
If we suppose that you have a linear relationship (which is common for gas prices), you can find the number of gallons she can buy by either locating the point on the graph that corresponds to $30 or by using the equation of the line if it's given.
For example, if the price of gas is $3 per gallon, you can calculate the number of gallons like this:
\[ \text{Number of gallons} = \frac{\text{Total amount of money}}{\text{Price per gallon}} = \frac{30}{3} = 10 \text{ gallons} \]
If you have the price of gas directly from the graph or another specific model, substitute that price in to find the exact number of gallons.
If you can provide me with the price per gallon indicated by the graph or any other details, I would be able to give you a more precise answer. Otherwise, from the method above, you can easily calculate it!
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