How do you calculate the area underneath the demand curve when it asks what the total value is

Total utility

Explanation:

The demand curve gives the amount acceptable to the consumers as price for a given quantity of a product. That is to say, given the available quantity of a product, the height of the demand curve gives the amount the consumers estimate the worth of the product

The area under the demand curve, therefore, represents the amount of utility or satisfaction that can be derived from a good or service, given that the demand curve is the representation of the estimation of the worth of a good by a consumer and price that the consumers pay is the utility cost

answer; specific performance;

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.