1). find the equation of the circle graphed below

2). on the axis above, sketch the rotation of the circle around the line x=15. what shape is formed from this rotation?

3). the state of colorado is approximately square, with a width of 323 miles. The population of Colorado is approximately 5,541,000. What is the population density of the state of Colorado?

4). The area of the continental United States is approximately 3,120,000 mi.². If a fallen star is headed towards the continental United States, what is the probability it would land in the state of Colorado?