How Does Accretion Impact Galaxy Formation According to the IMF?

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astrofunk21
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Homework Statement


I had a homework problem which was already due. I got the solutions for the homework and still don't understand where the solution is coming from. The question and solution are located here: http://ircamera.as.arizona.edu/Astr_540/PS3_soln.pdf The problem is #3.

Homework Equations


The equations are shown in the solution.


The Attempt at a Solution


My attempt really wasn't much. I really didn't have much time to work on it. Now that I've looked over the solution, it looks completely foreign to me haha maybe some of you guys can explain what's happening in the solution.
 
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The explanation will be better if we know how you would approach the problem - now that you have the time to think about it some more.
From what you've supplied, the model solution involves applying equations from a textbook.