Gasoline costs a fixed dollar amount per gallon, or unit rate, that you pump. You can write an expression to help you predict how much it would cost to fill up your tank. Because the amount of gas that you buy can vary, you can represent this measurement with a variable.
If gas costs $3.25 a gallon on a particular day, then the expression could look like 3.25x.
What does the x represent?________________
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The x represents the amount of gas purchased (in gallons).
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