A:AnswerIt has 1 USB-A port, and 2 USB-C ports (left and right sides). You cannot use Microsoft Office - but you can use Google Drive / Suite, which includes the same apps.
A:AnswerI have 3 usb hubs, one is brand new and two are much older usb 2's. All of them work very good on my three chromebooks from different manufacturers.
A:AnswerIn my opinion, it’s not worth repairing. Just replace.
I don’t know your situation, of course, so maybe it is worth it to you. At least think about it if you haven’t.