Dear Anna,

 Please consult

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

for the full solutions.

You got  110 points (out of 120).

Everything was right except:

#7: -2 points (an EF is a sum of DISTINCT unit fractions)

#12: -8 points  (You started the right way, using the definition, but you were requested to use the other method. I gave you 2 token points for starting it correctly the other way)



 Best wishes,

   Dr. Z.