Binary Search Trees - General Questions

The keys 15, 30, 55, 80, 75, 20, 45 are inserted in this order into an empty binary search tree. What is its preorder traversal?

The keys 80, 25, 30, 55, 70, 20, 75 are inserted in this order into an empty binary search tree. What is its preorder traversal?

The keys 35, 40, 15, 45, 60, 80, 65 are inserted in this order into an empty binary search tree. What is the height of the tree (number of levels)?