Final answer:
In a TREC hearing, a majority of the commission members must agree to a decision to suspend or revoke a license.
Step-by-step explanation:
In a TREC hearing, the decision to suspend or revoke a license must be agreed upon by a majority of the commission members. The exact number of commission members required to agree may vary depending on the specific rules and regulations of the TREC (Texas Real Estate Commission). However, in general, a simple majority is sufficient for a decision to be made. For example, if there are 7 commission members, at least 4 of them would need to agree on a decision.