Dear Robert,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/q6S.pdf

for the full solutions.

You got 5 points (out of 10).

#1,2,3 were correct.

#4 was completely wrong. The answer x=1 is correct, but by pure coincidence. u=2, v=-1 not u=1 v=0.

 Best wishes,

   Dr. Z.