Two members of the authority shall constitute a quorum. The affirmative vote of a majority of a quorum shall be necessary for any action taken by the authority. A vacancy in the membership of the authority shall not impair the right of a quorum to exercise all the rights and perform all the duties of the authority. Each meeting of the authority shall be open to the public and shall be held in accordance with Article 9 (commencing with Section 11120) of Chapter 1 of Part 1 of Division 3 of Title 2 of the Government Code. Resolutions of the authority need not be published or posted. The authority may delegate by resolution to one or more of its members or its executive director any powers and duties as it may deem proper.