Question 22930
There should be no need to explain "mcg", to tutors!! But apparently some tutors do not know that this means "micrograms" or 1/1,000,000 of a gram.  Amazingly, tutors in algebra.com can actually score points by exposing their ignorance and stating that THEY DO NOT KNOW HOW TO SOLVE THE PROBLEM!!  It's a weakness that probably has no cure.  


I must disagree with the previously posted comment by the tutor who said the reason your question was not answered was because it was not stated clearly!  Your question was clear enough.  It's just a hard problem that MOST TUTORS HAVE NO CLUE AS TO HOW TO SOLVE--or perhaps you should post only one question at a time, instead of posting THREE blockbusters in one problem!!  


As to a solution, I didn't solve it because I only have about 10% confidence that I could get it right!  


I'm very sorry, but now there are TWO tutors who have scored a point on this problem without giving you a solution.  Perhaps you should re-post it.  We do have some tutors who can do this one--maybe Kenny or Longjonsilver???


R^2 at SCC