Final answer:
The typical speed limit in a business district is 25 miles per hour, unless otherwise posted.
Step-by-step explanation:
The answer to the question "Unless otherwise posted, the speed limit in a business district is _________." is 2) 25 miles per hour. This is the typical speed limit in most business districts unless otherwise indicated by posted signs. It is important to follow speed limits to ensure the safety of pedestrians and minimize the risk of accidents.