(a) The board has all powers necessary, convenient, or incidental to carry out the purposes for which the district was created.
(b) The board has complete management and control of all district business, including the power to negotiate and contract with any person to purchase or lease land, to construct and equip a hospital system, to operate and maintain a hospital or hospitals, and to negotiate and contract with other political subdivisions of this state or with private individuals, associations, or corporations for those purposes as the board determines necessary or desirable.