I don't understand the questions. Can you help and explain me shortly? Thank you
Give the handful of definitions of justice given in the Republic and Socrates arguments against them. Do you think Thrasymachus’s argument is correct, and if so, how would you argue for injustice being better than justice and leading to a happier life?

In order to be able to answer the question you will need an understanding of Plato's Theory of Justice. Do you have such an understanding?