# Math Help - Exponential models

1. ## Exponential models

Exam is over and I got help from someone else, no one on here wanted to help, or didn't see it.

2. 1) For the equation $N= 1000e^{-0.115t}$

a) Find $t$ when $N =500$

$500= 1000e^{-0.115t}$

Now solve for $t$

a) Find $N$ when $t =28$

$N= 1000e^{-0.115\times 28}$

Now solve for $N$

3. Thanks man, yeah I already got 1 b), but thanks.