Travis received a letter from him bank saying that his checking account balanced fell below zero. His account transaction log is shown below. On which line did Travis make a mathematical error?

For this problem we need to identify on which line Travis make a mathematical error. And if we look careful we see that the mistake is at Line 4 the reason is because:
[tex]180-188=-8[/tex]And the actual value in the balance is 8 not -8