We're given :
Patricia originally has $3425.82 in her account.
After that, she deposits $9120.75, meaning her amount in her account goes up by $9120.75
Lastly, she withdraws $185.90, meaning her amount in her account goes down by $185.90.
Therefore, after the transactions, she has a total of : 3425.82 + 9120.75 - 185.90 = $12360.67