Sam received $10.50 in interest after placing money in his bank. if the account paid 4% in simple interest and he only left it in the account for 9 years, what is the principal?

$29.166

Explanation:

I = p x r x t

Where I= Interest: $10.50

P= principal amount:

r= interest rates: 4% or 0.04

t= time in years: 9

Therefore;

$10.50 = P x 0.04 x 9

$10.50 = P0.36

P=$10.50/0.36

P=29.166

Principal = $29.166

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.