please show me step by step

2. (6 points) Determine whether the following statements are true or false. Briefly justify your answer. 1. If f(n) is (g(n)), then 2f(n) is (2g(n)). 2. f(n)+g(n) is (min(f(n),g(n)). 3. 2na is O(2n), where a is a constant