79,000 people live in a circular region with a population density of 513 people per square mile. What is the radius of the region

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

Standard deviation of 19,29,21,22,23

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square