Solving 3 Different Trig Equations (find variable)

Here are a few trig equations, all three of them involve finding the variable. I've gotten some different answers for all of them so I was wondering if anyone could help.

By the way, I'm not sure on how to post images from image shack so could someone PM me on how to post a jpeg which has been uploaded to imageshack on this site.

Here's the first attempt:

http://img329.imageshack.us/img329/5...trigrw7.th.png

If that doesn't work, here's the link to the three questions:

http://img329.imageshack.us/img329/5343/z1trigrw7.png

-Thanks