I have a placement test for my community college. I was taking the practice placement test, and is very simple. Almost, offending to other people (I think). But I got a very low score on the practice test, and I'm afraid I might get placed into remedial classes which I get no credit for and have to pay.

Therefore what is the best way to study the following?

I'm thinking about reading some reviews they gave me, from purple math (which I don't always clearly understanding), watching videos on Khan Academy, and asking questions on this forum. But, I don't know if 5-10 questions on the same topic per day might annoy people. Then again I believe it might help me more to annoy you guys with 5-10 topics per day, rather than play Playstation 3 and flight simulator everyday (for those who like video games).

I usually have problems with topics like the following:

Source:"college.measuredsuccess.com

1) Simplify.3xz + (5x + 3z)(7x – 2xz +y – 4z)

2)Which value ofx, if any, makes the following expression undefined?

3)So what is your opinion?

Solve the inequality and graph on a number line

7x + 4 ≤x – 2