Answer:
Part A: 3218
Part B: 6710
Explanation:
For Part A, you need to subtract 274 from 3492. 
3492-274 = 3218.
They sold 3218 tickets on the second night. 
For Part B, you need to add the number of tickets they sold on opening night AND the second night. 
3492+3218= 6710.
They sold 6710 tickets in total.