there are currently 54 million cars in a certain country, decreasing by 4.3% annually. How many years will it take for this country to have 31 million cars? round to the nearest year.

Question

anonymous · Answer

The exponential growth model is needed in this question. 
Formula is below 
P(t) = Poe^(kt)

anonymous · Answer

31=54 e^0.043?

anonymous · Answer

your close. 
31 mil = 54 mil*e^(-0.043t)

anonymous · Answer

It says decreasing by 4.3% so it's going to be -0.043

anonymous · Answer

Do you know how to solve it from here?

anonymous · Answer

Im going to try

anonymous · Answer

Ok, it's always good to give it a try :D

anonymous · Answer

12.9069? round to the nearest year would be 13?

anonymous · Answer

Bravo!

anonymous · Answer

I just did the problem and it was right

anonymous · Answer

thank you so much for your help:-)!!

anonymous · Answer

:D