Population density is calculated by taking the total population of the area being looked at and dividing it by the total land area in miles squared.

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Explanation:

Population density is the number of people living in a particular area per unit area. Population density does not only count the number of people living in a region but it also take into consideration the land area covered by the dwellers.  Mathematically it can be expressed as

population density  = population/area covered(km²)

The population of a region might be high but if the land area occupied by the dwellers is large the population density will be decreased.

A densely populated region is one which has a very large number of people living in a limited land area. Some regions are densely populated due to the job opportunity present and availability of basic necessity of life.  

answer; seattle and los angeles; (west)