Question

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.

Answer 1

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

Answer 2

31=54 e^0.043?

Answer 3

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

Answer 4

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

Answer 5

Do you know how to solve it from here?

Answer 6

Im going to try

Answer 7

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

Answer 8

12.9069? round to the nearest year would be 13?

Answer 9

Bravo!

Answer 10

I just did the problem and it was right

Answer 11

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

Answer 12

:D