So, here we have an exponential function.
Remember that an exponential function has the form:
Where a represents an initial amount, and r is the rate of this amount to change. (Increase, or decrease).
So, given that the population of City A in 2000 was 40 thousand people and the population increased by 13% each year, we can say that
So,
For city B:
But something different happens with city C. This is not an exponential function, this is a linear function.
So,
1) subtract from both sides
2) divide both sides by -2
(1)take the square root of both sides
(2) simplify
5) regroup terms
6) switch sides
7) break down the problem into these 2 equations
8) solve the 1st equation
(1) add 4 to both sides
(2) regroup terms
9) solve the 2nd equation
(1) add 4 to both sides
(2) regroup terms
10) collect all solutions
that's your answer!
I hope it understand you
Decuct 30 minutes from 10:08 = 09:38