Pennsylvania has a land mass of 44,816 square miles. what is the land area of pennsylvania rounded to the nearest hundred?

We just started the introduction into circles and i have no idea how to do this.

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

Find the distance between (0,5) & (-4,2)