Hello, I need some help understanding these questions:

Allocation III: x, = 4, y1 = 9, X2 = 9, yz = 4 13. What is the value of MRS!? 14. What is the value of MRS?? 15. State the equation or inequality that proves whether III is Pareto efficient or inefficient. 16. Is III Pareto efficient (PE) or Pareto inefficient (PI)? 17. What is the value of person 1's utility? 18. What is the value of person 2's utility? 19. What would person 1's utility equal, if 1 had 2's allocation? 20. What would person 2's utility equal, if 2 had 1's allocation? 21. Is III envy-free (EF) or not envy-free (NE)? Explain in your work.