Answer:
(a) The area is 0.03 square miles
(b) The population density is 12000 people per square miles
Explanation:
Given
See attachment for complete question
Solving (a): Area of Orchid Hill (in square miles)
The dimension of the neighborhood is 4 blocks by 3 blocks
Since each block are of the same dimensions
The area is calculated as:

If
then:


So, we have:



Solving (b): The population density of the neighborhood as people per square mile
From the question, we have:

--- calculated
So, the population density is:


