Hey, I hate to ask this much of someone to help but im in a real bad spot right now and my college exam is coming up monday and when handed a review to study, my mind went completely blank on half the review so I hope it wont be too much to ask if I request 5 or 6 problems that would help me the most.

The first one is, Subtract and simplify:

$\displaystyle

\frac {2x-3}{x+5} - \frac {x^2-4x-19}{x^2+8x+15}

$

- I know you find the lowest common denominator but even after it still doesnt come out to correct answer. Like the$\displaystyle x^2-4x-19$, but I couldnt find anything that can multiply other than 1 and -19 but still does not make 4.

$\displaystyle

Next one is simplifying it:

\frac

{1 - \frac {3}{x} - \frac {10}{x^2}}

{1 + \frac {11}{x} - \frac {18}{x^2}}

$

- On this one I have no clue where to even start other than to possibly flip all 3 fractions on the second part to multiply but then I recall something about crossing like denominators out first but I dont know for sure.

This next one just says solve, it looks easy but...

$\displaystyle

3x= \frac {4}{x} - \frac {13}{2}

$

- I thought this would be an easy one but I am doing it wrong. It looked like a zero property one where you get everything to equal 0 but I have to get two answers and I am only getting one.I actually think I said 5 or 6 equations but I dont want to ask too much of someone. If I can understand out how to do these ones on here it would help me better familiarize myself with the type of equations for the test coming. I may have trouble with a few more tomorrow so I may post a couple more here if its not gonna be too much to ask.

Thanks