# Math Help - Base-e Exponential Functions! Need Help@!

1. ## Base-e Exponential Functions! Need Help@!

Hi, im new here. I need some help on this problems. I tried plug in all the number the the equation Pert but got a wrong answer. Can somebody show me how to it. Thanks

2. Originally Posted by AlZebra
Hi, im new here. I need some help on this problems. I tried plug in all the number the the equation Pert but got a wrong answer. Can somebody show me how to it. Thanks
I don't see how you could have got 55821, even if you made the obvious mistakes. Why don't you show us what you did, and then we can correct any mistakes you made?

3. I did 0.08x15=1.2

Then e^(1.2)=3.320116923

Then

3.320116923x69770 = 231644.5577

That was my answer but it's wrong. Ignore the incorrect answer, in the picture. It just some random number i tried, but forgot to remove when i copy the problem.

4. Originally Posted by AlZebra
3.320116923x69770 = 231644.5577
Where is the 69770 coming from?

All you need to do is substitute the appropriate values, and solve for $P$:

$37469 = P\text{e}^{-0.08\cdot15}$

Or, alternatively, treat 37469 as the initial population, and make the rate an 8% increase:

$A = 37469\,\text{e}^{0.08\cdot15}$

Either should work.

5. Originally Posted by Reckoner
Where is the 69770 coming from?

All you need to do is substitute the appropriate values, and solve for $P$:

$37469 = P\text{e}^{-0.08\cdot15}$

Or, alternatively, treat 37469 as the initial population, and make the rate an 8% increase:

$A = 37469\,\text{e}^{0.08\cdot15}$

Either should work.
I tried your second method, and it turn out to be 124401, which is the the number i meant to use. I dont know where i got 69770 from, must be mix up with another problem.

Anyways i tried 124401 and it's wrong.

6. Originally Posted by AlZebra
Anyways i tried 124401 and it's wrong.
This is the answer I get, and unless I'm missing something obvious, it should be correct.

7. I provided everything that the problems has provided. There must be another method to do this because i did the same thing to another problem like it. And it's wrong.