I have downloaded some pdf files I need them for school but would like to read them on my PC at home. how do I get them to my PC.
If you have opened the pdf in ibooks on your iPad then when you sync the iPad they should appear in the books section in iTunes. You may need to turn this section on. From the menu bar click iTunes > Preferences (on a mac) Edit > Preferences - then in the General tab tick the box next to books.
It doesn't separate them out into ebooks and pdfs like iBooks does, but if you know what it's called you should be able to find it easy enough.
If you need to find in on your hard drive then right click the file and click 'show in finder' (on a mac) - not sure what you'd click on a PC.
hope that help