5 and 6 please and thank you

Question 5 What statement is equivalent to: "It is not true that Australia and China are both island."? Australia is not an island and China is not an island. Both Australia and China are island. Australia is an island, however China is not an island. Australia is not an island or China is not an island. Question 6 What is the negation of the statement: "I am not going and he is going."? I am going or he is not going. I am going and he is not going. it is not true that we are both going. None of the above