Final answer:
The safest method to assist a patient in a wheelchair descending a curb is to tilt the wheelchair backwards on its caster wheels, ensuring control and stability.
Step-by-step explanation:
The easiest and safest way to assist a patient descending a curb while in a wheelchair is in the backward position while tilting the chair up on the caster wheels. This approach provides better control and stability, reducing the risk of tipping over. When moving backwards, the larger, more stable drive wheels descend first, followed by the smaller caster wheels, allowing for a smoother and more controlled descent.