Final answer:
Before entering a roundabout, you must yield to vehicles on the roundabout and pedestrians.
Step-by-step explanation:
Before entering a roundabout, you must slow down and yield to vehicles on the roundabout. This means that you should wait for any cars that are already on the roundabout before you proceed. You also need to yield to pedestrians who are crossing the road or walking on the sidewalk near the roundabout. However, you do not need to yield to vehicles entering or vehicles exiting the roundabout.