Subject. Data structure

I need number 1 & 2 full answer please.

1. What values are returned during the following sequence of queue operations, if exe- cuted on an initially empty queue? enqueue(5), enqueue(3), dequeue(), enqueue(2), enqueue(8), dequeue(), enqueue(9), enqueue(1), dequeue(), enqueue(7), enqueue(6), dequeue(), dequeue(), enqueue(4), dequeue(), dequeue().

2. Suppose an initially empty queue Q has performed a total of 32 enqueue operations, 19 first operations, and 15 dequeue operations, 5 of which returned null to indicate an empty queue. What is the current size of Q?