Hi, Scott - You are correct, I mis-worded the equation...it was late last nite when I posted it - thanks for catching that.  it's MPL = change in quantity divided by change in labor.  (MPL = delta Q/Delta L) I can't view your solution right now because I am at work & sometimes things get blocked from view.  But from what I can see, It looks like this software is very capable, but very complicated for me to use.  The stuff I'd have to type in to get my answers looks like it might be as hard as trying to figure it out manually.  Ugh...I am a great student but math is not my thing.  This class is a killer, and I am so unfamiliar with this software that I may not be able to use it to help me at all, unfortunately.

Thanks for the tips on uploading, too - I will try that next time.  I'll take a look at your solution when I get home & see if I can apply that to the other quesions I have to answer.  The trouble is, there are all sorts of formulas - average cost, marginal cost, average fixed cost, average variable cost, marginal revenue, total profit, and so on.  Many of these have 2 or 3 (or more) step calculations to do before you get the answer, and then it has to be plotted correctly on the graph....sometimes more than one curve at a time.  I wish there was a program that did JUST math for economics.  If anyone knows of one...could you point me in the right direction?  Thanks much.

Thanks again, Scott.