I hate to say this, but all of you are brainwashed by topsquark. When he tells you his opinion about someone, it is not necessary true. He and some of you think that I am running a tutoring business. What the heck is that supposed to mean? First, it makes no sense, and second you don't have one single evidence. Even if that was true, it doesn't matter because you have to treat me as one of your students. The truth is that I am an engineering student who is struggling at mathematics, physics, and related subjects. I am studying Calculus III, but the university forced me to take algebra and some other low level subjects besides it because I failed two times. This is why you see a random level of problems from a simple circle to partial differential equations. I didn't have to tell you all of this. I am telling you now because if I don't you will never stop bothering me. When someone else, not Mario, presents a problem, you all rush to help him/her with a thousand of different ways with full details, even if it was a complicated problem. But when Mario presents a simple problem about the radius of the circle, all of you become detectives. He presented partial differential before. It is weird he is presenting a simple circle now. He must be in exam NOW. No no, he is running a business. No no he is cheating, and many many other of these none making sense stuff you keep telling each other. When you don't want to present a solution for a question I asked, just say it, so I don't waste my time spending my whole day running behind you to get a hint for a simple question. I have a lot of problems to solve, so I spend the whole day reading and studying, and I don't want to waste my time with you anymore. You have all failed to accomplish your jobs properly. This is my last message here and in every other forum. You will never see Mario again.