I'm in a calculus course in college right now and my professor wanted us to buy a copy of Maple, so I did.  I bought it for my Mac, but the software seems to be having trouble with basic operations, like adding, subtracting and multiplying.  If I were to try and add 2+3, for example, I can type in "2," but then when I try to type in "+," it deletes the two instead and freezes the Maple program itself.  I have no idea what's going on.  PLEASE HELP!!!