Final answer:
States have varying requirements for car registration timelines and display of license plates following the purchase of a vehicle or a move.
Step-by-step explanation:
The question relates to the legal requirements for car registration, which can vary by state. Although the question does not provide a specific period within which all cars must be registered with the Department Of Motor Vehicles (DMV), it commonly varies. In most cases, new residents or those who have recently purchased a vehicle are typically required to register their vehicle within a set number of business days, which could range from 10 to 30, depending on the state's law.
Furthermore, vehicles must display license plates on the rear, and often also the front, of the vehicle. The registration process involves providing essential information and documents to the DMV, paying any applicable fees, and receiving the license plates and registration document. Additionally, when someone moves and changes addresses, they should also update their voter registration, which can sometimes be done through the DMV, as exemplified by California's system.