1. A densely settled core of Census Tracts with a population of 72,000 would be considered a/an . 2. A statistical area that includes at least one urbanized area with at least 50,000 people is called a 3. Europe's urban population in 2014 was percent of its total population. 4. What are the requirements for a metropolitan area to have more than one principal city? 5. I am contemplating the expenditure of $150 million to construct a high-rise apartment complex in Downtown Tampa. What is my principal opportunity cost of building this project? 6. I am a developer of single-family residential communities in Florida. I am trying to determine how many homes I should build in my new community. Explain the principle I should employ to determine the right size for me my new community, and how the elements of this principle apply to my project. .