Final answer:
A child under the age of eight and who is less than 57 inches tall must be properly belted in a child safety/booster seat unless there are airbags.
Step-by-step explanation:
According to the given information, a child under the age of eight and who is less than 57 inches tall must be properly belted in a child safety/booster seat unless there are airbags. This means that if the car is equipped with airbags, the child does not need to be in a child safety/booster seat. However, if the car does not have airbags, then the child must be properly belted in a child safety/booster seat. The purpose of this requirement is to ensure the safety of young children when traveling in a car.