What is the difference between expository essays and business communication and how are they alike?

i need to respond to a question for school but i need some help. i need to know whta the difference and similiarities are between expository essays and business communication. I need to know what part does fact and opinion play. Please give me some kind of help.What is the difference between expository essays and business communication and how are they alike?
http://en.wikipedia.org/wiki/Expository_鈥?/a>



http://www.stanford.edu/~arnetha/expowri鈥?/a>



http://sbinfocanada.about.com/od/smallbu鈥?/a>

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