Dear Robert,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/q7S.pdf

for the full solutions.

You got 7 points (out of 10). #2: you lost a point. #4: totally wrong

 I did not take any points off for #5, but you could have phrased it better.


 Best wishes,

   Dr. Z.