I used to be able to do this a year ago, but I completely forgot everything about it, and I can't find anywhere in the index where it specifically teaches you how to tackle this problem.

http://www.dvc.edu/org/departments/assessment-center/College%20Level%20Math%20Sample%20Questions%20-%20Updated.pdf

The problem is #9

For those of you who cannot open a pdf, it is:

If f(x) = 2x + 1 and g(x) = x-1/2, then f(g(x)) =...

I would also appreciate help on solving any other problem on the sample worksheet. Thanks in advance