Final answer:
Real estate agents must disclose the presence of lead-based paint and provide lead hazard information to buyers of homes built during the time when it was used.
Step-by-step explanation:
Real estate agents must take certain steps when selling a home built during the time that lead-based paint was used. Firstly, they should disclose the presence of lead-based paint to potential buyers. Secondly, they should provide the buyers with any available lead hazard information pamphlets. Finally, the agents should ensure that the buyers have a 10-day period to conduct a lead inspection or risk assessment if they choose to do so. This is to give the buyers the opportunity to fully assess the potential risks associated with lead-based paint in the house.