First all let me say thanks to everyone who helped me last time I came around, I ended up getting an 89% on my first calc test, with most of your help. I'm back again with a few questions, maybe more as im only 50% done my total studying..

but one thing at a time.

I missed the lesson on chain rules, and the book talk is gibberish to me, I learn better with practice . The practice problem I have says:

Find dy/du , du/dx and dy/dx

y=u^2, u =4x+7

I tried working backwards but I don't know where to start, or anything.. any help is appreciated.