Can you please answer these question and explain the reasoning? Thank you.

6. Show to calculate merge complexity? how the sort time Part 3 (140 points, 10 each) Consider the code below, which is missing some variable declarartions: (From Java: The Complete Reference by Herbert Schildt) 1 class House t 2 House(String newAddress) f this.address = this.roommates newAddress; = new HashsetPerson>(); 4 6 7 String getAddress() ( return address; 9 void addRoommate(Person newRoommate) 10 roommates.add (newRoommate); if (roommates.size() MAXIMUM_OCCUPANCY) ( roommates.remove(newRoommate); throw new TooManyPeopleException(); 12 13 14 15 16 17 18 void getMaximumoccupancy() ( return MAXIMUM OCCUPANCY; 19)