You decide to take advantage of the current online dating craze and start your own Web site. You know that you have 550 people who will sign up immediately and, through a careful marketing research and analysis, determine that membership can grow by 29 percent in the first two years, 23 percent in year 3, and 18 percent in Year 4. How many members do you expect to have at the end of four years?

Number of members in every year need to be calculated.

Starting member numbers = 450

In Year 1, members = 450 * (1 + 27%) = 571.500000

In Year 2, members = 572 * (1 + 27%) = 725.805000

In Year 3, members = 726 * (1 + 22%) = 885.482100

In Year 4, members = 885 * (1 + 18%) = 1044.868878

Answer = 1,045

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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.