SUM (accounting) question

[crossb8]

Hello, I am wondering why my total does not add up to $6,900. It may be more of an accounting question than an Excel one but I’m not sure. Thank you!
Screen Shot 2019-07-21 at 2.18.31 PM.png

[BanginMyHeadOnMyDesk]

Because the 100 in brackets in row 11 is a negative number.

B.

[crossb8]

I understand that. but I think i realize why now. Thank you B.