Each trustee shall be entitled to one vote. Six trustees shall constitute a quorum for the transaction of business and any official action of the board shall be based on the majority vote of the trustees present. Unless otherwise expressly provided in sections 103.003 to 103.175, a meeting need not be called or held to make any decision on a matter before the board. Each member must be sent by the executive director a copy of the matter to be decided with full information on the question from the files of the plan. The concurring decisions of six trustees may decide the issue by signing a document declaring their decision and sending the written document to the executive director within fifteen days after the document and information was mailed to the trustee. If any trustee is not in agreement with the six trustees, the matter is to be passed on at a regular board meeting or a special meeting called for that purpose.