a) f_n(x) = (x/n)e^(-x/n), D = [0, infinity)
b)f_n(x) = (x^n)/(1 + x^2n), D = [2, infinity)
Sequences of Functions and Uniform Convergence are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.