Question #dba1a
1 Answer
Feb 21, 2017
The population 2 years hence was 2000 people.
Explanation:
For each year, the end population is 90% of the starting population (100%). That means that:
and
So, to know the population from a year ago, we have to set up the following equality:
Now, with a little algebra we do the following steps to single out
1) multiply each side by
2) multiply each side by 100
3) multiply each side by
Leaving us with:
Now if we do the same process with 1800 to start with, we get the final equation: