I have a test tomorrow and I'm not getting the answers on a study guide for a couple and I forgot how I did another and lost all my understanding.
These are the formulas I was given: http://i.imgur.com/6rwL0S6.jpg
This is #4 (which I got close to the answer but not the entire thing): http://i.imgur.com/NaJhF5Y.jpg
My work: http://i.imgur.com/l8OHuCD.jpg
This is #9 (where again I got close to the answer but it's not negative): http://i.imgur.com/irn4fUd.jpg
My work: http://i.imgur.com/VGdxQkx.jpg
This is #11 (which I've done before but looking at it again I'm very confused and have no understanding of my work. It'd be nice if someone could show me this one step by step): http://i.imgur.com/8RKTBfe.jpg
My work: http://i.imgur.com/nexHgNv.jpg
These are the answers: http://i.imgur.com/qXXNP0j.jpg
Thanks in advance.