ASAP ! Worth 60pts Situation:
Find the substance's half-life, in days.
Round your answer to the nearest tenth.
A 46 gram sample of a substance that's a
by-product of fireworks has a k-value of
0.1374.
Enter the correct answer.
N= Noekt
DONE
No = initial mass (at time t = 0)
DOO
N = mass at timet
k = a positive constant that depends on
the substance itself and on the units
used to measure time
t = time, in days

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.