Big theta notation help

State the big Theta class (in simplest form) that each of the following functions belongs to. (a) log(n) + n log(n) (b) n log(n^2) + n log(n) (c) 6n^2 + 80n + 2 (d) Delta n + Delta n (e) log(n) + log(2n) + log(3n) (f) 1 + 2 + 3 + 4 + ... + (n - 1) + n (g) 3^2n + 2^3n