Re: PDF files
I think you need the full version of Adobe Acrobat to edit PDF's. I have been wrong many times before however. There are some freeware apps that can do it, but all of them I have seen put a watermark on there.
Change the world. Of one person. Today.
If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.