Question

Situation: a 9 gram sample of a substance that's used for drug research has a k-value of 0.1459.

N=Noe^-ktNo=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 to the nearest tenth.

Answer 1

answer is 4.75

Answer 2

thats not the answer

Answer 3

4.8
is the correct answer

Answer 4

4.8 is correct