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.
The x represents the amount of gas that you buy, or the number of gallons that you pump.
I do not understand
I apologize for any confusion. In the given expression, "3.25x," the x represents a variable that represents the amount of gas that you buy or the number of gallons that you pump. This means that if you want to know how much it would cost to fill up your tank, you would substitute the value or measurement of the amount of gas (in gallons) you want to purchase in place of x in the expression and calculate the result. For example, if you want to buy 10 gallons of gas, you would substitute x with 10 in the expression: 3.25 * 10 = $32.50. Therefore, it would cost you $32.50 to fill up your tank with 10 gallons of gas at a rate of $3.25 per gallon.
