Question

Situation:
A 40 gram sample of a substance thats used for drug research has a k-value of 0.1476.
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.