To find Tessa's account balance after the transactions, we can follow the calculations step by step.
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Starting balance: $90
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Paying cable/internet bill:
- Balance after payment: \( 90 - 60 = 30 \)
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Depositing from part-time job:
- Balance after deposit: \( 30 + 50 = 80 \)
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Writing a check for credit card bill:
- Balance after writing the check: \( 80 - 65 = 15 \)
So, Tessa's account balance is $15.