Dear Daniel,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/q9S.pdf

for the full solutions.

You got 5 points (out of 10). Here is what you got wrong:

#1,2,3 were right


 Best wishes,

   Dr. Z.


P.S. I was sorry to hear about your computer problems. If you want to have a make-up let me know.