A9 gram sample of a substance that's
used for drug research has a k-value of
0.1453.
n=noekt
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 substances half-life, in days. round to the nearest 10th