It seems like there is some missing information in your question regarding how much of a roll of paper towels Cady uses each week. If you provide that information, I can help you calculate how many rolls of paper towels she will use in 8 weeks.
For example, if Cady uses \( x \) rolls of paper towels each week, then in 8 weeks she would use:
\[ 8 \times x \text{ rolls of paper towels} \]
Please provide the value of \( x \) or any other details you have!