# Thread: Exponential Growth and Decay

1. ## Exponential Growth and Decay

I am really stuck on this half-life thing... I just don't get how they get k=-.000121

2. Originally Posted by dto
I am really stuck on this half-life thing... I just don't get how they get k=-.000121
What part of the solution do you get stuck on?

3. Originally Posted by dto
I am really stuck on this half-life thing... I just don't get how they get k=-.000121
Well there is a pretty complete explanation there, exactly where do you lose the thread?

CB