There are 1000 milliliters (mL) in a liter (L). Remember that the prefix milli- means one thousandth.
Since Tony made 14 liters, that means he made:
[tex]14 \: L \times \frac{1000\: mL}{L} = 14000 \: mL \: total[/tex]
His guests drank 9500 mL, so subtract from the total amount of lemonade made to get the amount left over:
[tex]14000 \: mL - 9500 \:mL = 4500\: mL[/tex]
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Answer: 4500 mL
