My professor Dr. Cryptic gave us a quiz today in class, and on it there was an extra credit opportunity. Most of the questions weren't too difficult to figure out; however no one in the class could decrypt the extra credit message. How do I decrypt the extra credit question?

The quiz:

> 
> 1. Decode the following messages:
> 
> 
> 	* "This uses a cipher."
> 	* "Guvf nyfb hfrf n pvcure."
> 	* "Fdtyr xfwetawp ntaspcd ymwqe ftuzse tmdpqd"
> 2. Can you decode these too?
> 
> 
> 	* "14211302051819 011805 062114"
> 	* "0513020504040504 03091608051819 110215 181102141502"
> 3. This one is a bit more tricky. (Not really but here is a hint 110525)
> 
> 
> 	* "Estd nx sqhbjx"
> 
> 
> Follow the instructions in the following message. After doing so, you will receive 15 points of extra credit on the final for the class.
> 
> 
> * Wg quwrhyw dnnad fjdtcc rq lgu zrqdd xeo vxvl ahcwj dl kuubw iauu hxqswqymqdedd vixg lldcm cr fdzim whal vuyt wr vnduch wg sxy orrv chceh..
> 
> 
> 

He also gave one final remark after passing out the test saying, "Remember, I am the key to unlocking knowledge. By using all of what I have taught you, you will be able to unlock even more."