(a) The commissioners court shall:
(1) post in a public place in the county courthouse a notice of the time, place, and general subject of the public hearing; and
(2) publish the notice in a newspaper of general circulation in the county.
(b) The notice must be:
(1) posted for the 10 days preceding the date of the public hearing; and
(2) published at least once a week for the three weeks preceding the week the public hearing is held.