Final answer:
Fire extinguishers must be inspected and recharged, if necessary, to ensure their proper functioning in extinguishing fires.
Step-by-step explanation:
Fire extinguishers must be inspected and recharged, if necessary, to ensure that they are in proper working condition and can effectively extinguish fires. Inspections are important to check for any damage or malfunctions, while recharging is necessary to refill the extinguisher with the appropriate agent or propellant. This maintenance ensures that the fire extinguisher is ready to be used in case of an emergency.