Duties and powers. The Zoning Board of Appeals shall have such powers and duties as are granted to it or imposed on it by state law. The Zoning Board of Appeals may adopt, after a public hearing, such rules, regulations and forms as it may deem necessary for the proper and efficient discharge of its duties, so long as such rules, regulations and forms do not conflict with state law. Such rules, regulations and forms are subject to the approval of the Town Board.