For purposes of doing whatever is necessary or appropriate to comply with the Internal Revenue Code and to establish or maintain the exclusion from gross income for federal income tax purposes of interest on the bonds, the financial officer and the chief executive officer may each:

(1) take any other or further actions;

(2) enter into any agreement or covenant regarding the use of proceeds, including any investment earnings on proceeds, the deposit of money to the rebate fund, and the making of rebate payments; and

(3) provide certifications of facts and estimates.