I am very sorry with being so urgent, however I am having terrible trouble with my Calculus homework - can't figure it out at all and I am working for hours at it.

I have several problems that I may need help explaining. I would prefer not to just get the answer, and so would prefer just hints for now, however I really want/need to get full credit on this assignment, and I have a date set for 7 PM tonight.

Please help me

The first problem I have issues with is:

Find the limit of x approaches negative infinity of the function: ((10-15x)/(9+x)) + ((9x^2 + 13)/(12x-5)^2)