For each of the following expressions, find if they are (1), (log n), (n), (n^50), or (2^n):

1. f1(n) = 500 + 5 log n 2. f2(n) = 5000n 3. f3(n) = 500 + n + 5 log n + 50n 4. f4(n) = 5n log n + 2^n + 300n^50