Is f (g), O(g), or (g)?

1. f(n) = n³ g(n) = n²

2. f(n) = 4n³ + 4n + 4 g(n) = 2n³ + 2n² + 2

3. f(n) = n² + 200 g(n) = 200 n

4. f(n) = n^3/2 g(n) = n^4/3

5. f(n) = 75 n log (n¹⁰⁰) g(n) = n (log n)¹⁰⁰