In 1990, the population of africa was 643 million and by 2000 it had grown to 813 million. Write an exponential model in base b for the population of africa t after 1990. What is the annual percent increase?

Question

lilg132 · Answer

126.4385692068429%

anonymous · Answer

I need to see the work

lilg132 · Answer

813 million divided by 643 million * 100 = percentage

lilg132 · Answer

remember to click good answer :)

anonymous · Answer

no, definetly not an exponential model, and its suppose to grow not shrink

lilg132 · Answer

lol from 1990 it grew from 643 million people by 126.4385692068429% to 813 million

anonymous · Answer

I just know thats not right lol, its not an exponential model :/

anonymous · Answer

I'm going to get rid of the million part just so it's easier to type.
You'll have something like:
$$813=643^{10k}$$
I think that's right, then solve for k and you'll have a formula like:$$C=C _{0}^{kt}$$

anonymous · Answer

umm,well ive never seen that in class, haha, not sure that thats how you do it,

anonymous · Answer

Might not be, it's been a while since I've done any with base b.

anonymous · Answer

yeah i have no clue :/ haha