Dear Daniel,

 Please consult

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

for the full solutions.

You got  98 points (out of 120).

Here is what you got wrong:


#3: -10 points

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

#12: -10 points (you started correctly, but using the DEF., but you were asked to do it using "lnown series",
so even if you would have finished it (with the approach you started) you would have gotten no points)



 Best wishes,

   Dr. Z.