Situation: A 33 gram sample of a substance that's
used to detect explosives has a k-value
of 0.1473.
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 substances half life, and days. Round your answer to the nearest 10th

Half life = 4.7 days

Step-by-step explanation:

Formula to get the final amount of the substance after the time 't',

Here, = Final amount of the substance

= Initial amount

k = decay constant

t = Duration or time

Now by substituting the values in the formula,

If [For half life]

ln(2) =

0.69315 = 0.1473t

t = 4.71 days

t ≈ 4.7 days

Therefore, half life of the substance is 4.7 days.

56

step-by-step explanation:

there are 25 people coming to the party

step-by-step explanation:

the text says that there will be 22 children at this party, 1 teacher, and 2 parents. so if you add them all together (22+1+2) it will equal 25. (=25)