Dear Vivian,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/mt1S.pdf

for the full solutions.

You got  90 points (out of 120).

Here is what you got wrong:

#3: -10 points (not attempted)

#4(i): -3 points  (you have to check at 5 different places)
#4(ii): -5 points (not attempted)

#6: -2 points (An Egyptian faction is a sum of DISCTINT reciprocals)


#12: -10 points (not attempted)






 Best wishes,

   Dr. Z.