###For you, using Microsoft Office 2011 is the best way to go, IMO.
For you, using Microsoft Office 2011 is the best way to go, IMO.
In case you are not familiar which TeX tools in OSX, you may continue reading :)
I prefer to use TeXShop or LyX for mathematical documentation. You can also download the whole MacTeX package with is a collection of various tools for using TeX on OSX.
A very convenient solution provides LaTeXiT which allows to create simple equations and export them as a picture or other format for you to use in a word document. You can create equations with their preamble, compile them and export them. I keep the code of the equations in a simple text document in case I need to edit something later.