I am posting here because this is NOT homework. Problems are finished. However we have an exam on friday for calculus 1 class and well... I've been trying real hard to understand it but professor has a real strong accent and he speaks too low, no one can hear a thing! Anyway, we did the review and I was wondering if someone would explain how he got to those solutions... I marked the parts that I especially don't understand... we will also be allowed to have notes on the exam, so any formulas that you think might help me, or anything at all, will be of great help if you tell me. There are 5 problems, and if a problem didn't fit in one page, I marked the photo as "Problem 5-a; Problem 5-b" for example. The last problem (problem 5) didn't fit so the link to the pictures are here: http://img600.imageshack.us/img600/592/lxkk.jpg [Broken] http://img28.imageshack.us/img28/4107/fkdt.jpg [Broken] I hope you guys can clarify these things to me since the professor who is getting paid to do that, didn't. And yes, I did go to his office hours.