Dear Anna,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/mt2S.pdf

for the full solutions.

Since problem 6 was assigned by mistake, the total score is 110, and then multiplied by 120.

You got 120 points (out of 120).  Good Job!


Here is what you got wrong:

 Best wishes,

   Dr. Z.