You'll likely need FLT = Fermat's Last Theorem (google it if you don't know it):
(e) as is a generator of the multiplicative group , and thus there does exist some
unique power of it that equals 7 modulo 11. Try and error (since discrete logarithms seem to be out of our depth for
the time being) gives us
(f) Do a list of quadratic residues modulo 11, and check which one, if any, equals ...
(h) It's easy to check that (why?)
In fact, try to show that already ...