Question

Situation:
A 18 gram sample of a substance thats used for drug research has a k-value of 0.1226.
N=Noe^-kt
No=initial mass( at time t=0)
N=mass at time t
k=a positive constant that depends on the substance itself and on the units used to measure time
t=time, in days

Find the substance's half-life,in days.Round your answer to the nearest tenth.

Answer 1

using the exact same method you use 0.5No again and solve for t giving t=(ln0.5)/(-k)=5.7 to the nearest tenth