2. For each function below, give an asymptotic upper bound using big-Oh notation. Your answer should be as tight and simple as possible.

a) f(n) = 4n^3 + 5n^2 log n O( ____ )

b) f(n) = 3n + 4 log n + 2n O( ____ )

c) f(n) = 1.6n + n^5 O( ____ )

d) f(n) = 2 log log n + log(n/2) O( ____ )