Answer: 42804 people per square mile
Step-by-step explanation:
As we know Population density = 
Given, population of New York City = 8.55 million
Area of New York City = 300 square miles
Then, population density of New York City = 
[1 million = 1,000,000]
Population of Manhattan = 1.64 million = 1640000
Area of Manhattan = 23 square miles
population density of Manhattan = 
Difference = 71304 - 28500 =42804
Hence, population density of Manhattan is 42804 people per square mile greater than that of New York City.
The solution (with steps) and answer are included in the images below.
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7.5 pounds + 3.75 pounds = 11.25 pounds
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Answer:
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Step-by-step explanation: