How can I tell what version of Adobe I have?

When you have your PDF opened in Adobe, click on FILE, and then click on PROPERTIES.

            A window will open up with all of your document properties.  Under the tab labeled Description, you will see:  

            PDF Version: _________ (Whatever version you have will be listed there.)

            EXAMPLE – PDF Version : 1.7 (Acrobat 8.x)