Need serious help with VB2010 assignment

Well, one of the things I had attempted that I kind of forgot how to do was use Subs and Case statements. I could call a subroutine but the variables from the Sub failed to work in the main program so I just used the GOTO command since it just works. Especially if you write a program with Line numbers like we used to do back in GWBASIC and BASICA days. If I wanted to make it even more complicated, I could have made a simple number based menu. If I wanted to add graphics, I could have done so as well. But since I was focusing on the Calculation side, I left it at that. ^_^ I have created GUIs in QBasic that used the mouse to navigate.