Queues - General Questions

Starting with an empty queue: enqueue(9), dequeue(), enqueue(4), enqueue(2), dequeue(), enqueue(6), dequeue(). Which element is at the front?

Starting with an empty queue: enqueue(7), dequeue(), enqueue(5), enqueue(9), enqueue(3), enqueue(4), enqueue(7). Which element is at the front?

Starting with an empty queue: enqueue(8), dequeue(), enqueue(1), dequeue(), enqueue(8), enqueue(9), dequeue(). Which element is at the front?

Starting with an empty queue: enqueue(1), enqueue(1), dequeue(), enqueue(3), dequeue(), enqueue(6), dequeue(). Which element is at the front?

Starting with an empty queue: enqueue(9), enqueue(5), enqueue(5), enqueue(3), dequeue(), dequeue(), enqueue(6). Which element is at the front?