It would be better for you to get a book that explained these things. Calculus for Dummies Amazon.com: Calculus for Dummies: Mark Ryan: Books, The Complete Idiot's Guide To Calculus Amazon.com: The Complete Idiot's Guide to Calculus, 2nd Edition (Complete Idiot's Guide to): W. Michael Kelley: Books may pitch at the level you need. Do you have a textbook?

Alternatively, I'm sure any search engine will turn up gazillions of hits, some will be useful to you.