Answer:
- United States: 84 people per square mile
- Mongolia: 5 people per square mile
- Bangladesh: 2775 people per square mile
Explanation:
You want the population densities of the United States, Mongolia, and Bangladesh given the populations and areas shown on the map.
Population density
As the problem statement tells you, the units of population density are "people per square mile." That means you find its value by dividing the number of people by the number of square miles.
The given values of people and square miles are both rounded to the nearest thousand, so we can save ourselves some typing by finding the ratio of thousands of people to thousands of square miles. The calculator shown in the attachment gives the answers for the three countries of interest:
- United States: 84 people per square mile
- Mongolia: 5 people per square mile
- Bangladesh: 2775 people per square mile
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Additional comment
The attachment shows the three calculations done "all at once." When a number of calculations are all done the same way, it is often convenient to do them as a list. This takes fewer keystrokes, and displays the answers in less space than doing the calculations one at a time.
A spreadsheet is another useful tool for doing repetitive calculations.