Postby Tiffany Dao 1A » Tue Feb 27, 2018 9:28 am
They are the same equation. The only difference is the way you write the equation that they are derived from. In this case for ln [A]t/[A]o = -kt, it is derived from ln[A]t - ln[A]o = -kt
While the other equation comes from ln[A]o - ln[A]t = kt, which can be rewritten as -ln[A]t +ln[A]o =kt, if you compare this to the above equation, you just multiplied both sides by -1, therefore they are pretty much the same thing and should give you the same answer.