Questions on Regressions and F/T Tests

#1
Hello,

So I am basically doing this Statistics assignment for extra credit and I am totally confused.

http://i.imgur.com/8BXoGNL.png
http://i.imgur.com/Mtc2a6m.png
http://i.imgur.com/ezsZOYf.png

I feel ok with my answers for the first two questions but it would be nice to know if they are actually correct, or what I did wrong. I am totally lost when it comes to 3 and 4. I feel strongly that my 3 is actually incorrect, and am lost on 4. I will provide links to all of them.

https://onedrive.live.com/redir?resid=C5BAAAAD0E01DBEF!112&authkey=!AJvZL6P5dTtm4xo&ithint=file,xlsx

https://onedrive.live.com/redir?resid=C5BAAAAD0E01DBEF!114&authkey=!AJKV-MTkxiCJnzk&ithint=file,xlsx

https://onedrive.live.com/redir?resid=C5BAAAAD0E01DBEF!111&authkey=!AA23uf8-dAzBvDg&ithint=file,xlsx

https://onedrive.live.com/redir?resid=C5BAAAAD0E01DBEF!113&authkey=!AP1hgO5YjoyFfhM&ithint=file,xlsx

If you could tell me what I have done wrong or what I need to do instead, I would be very grateful.