Final answer:
Karen's balance ends up being $74 after several deposits and withdrawals.
Step-by-step explanation:
To calculate Karen's balance, we need to keep track of her deposits and withdrawals. Let's start with her initial deposit of $165. Then, she withdraws $25, so her balance becomes $165 - $25 = $140. Next, she writes checks for $23 and $17, so her balance becomes $140 - $23 - $17 = $100. She then makes another deposit of $45, bringing her balance to $100 + $45 = $145. Finally, she writes checks for $18 and $33, and withdraws $20, so her balance becomes $145 - $18 - $33 - $20 = $74. So, her balance is $74.