kt vs. -kt?

[Tiffany Chao 2H]

I'm doing 7B and I've noticed that for first order integrated law, the solutions manual will use the equation ln([A]/[A0]) = kt and other times,
ln([A]/[A0]) = -kt. I've been consistently using ln([A]/[A0]) = -kt and will sometimes get a negative value (depending on if I'm calculating k or t). When my answer is negative, the solutions manual will typically use ln([A]/[A0]) = kt to get a positive value. How does that work?

Thanks

[Tiffany Chao 2H]

Never mind... I figured out that it's because they switch between ln([A0]/[A]) or ln([A]/[A0]).

[Nico Medina]

I was wondering this too, thanks for the help!