Identify if the following contracts must be in writing to be enforceable. Please explain why or why not.Yes and no answers are not enough for credit, you must explain.

1. A contract to hire a banquet manager for three years
2. A promise made by a casino patron to cover the betting debts of his friend.
3. A contract to purchase 4 acres of land on which a buyer indents to build a restaurant.
4. A contract to hire a musical trio to play over two weekends at a restaurant for $1500.