20 points 3. The half-life of Co-60 is 5.3 years. If the initial mass of the sample is 1
kg, how much will remain after 15.9 years.

0.125kg

Step-by-step explanation:

an equation can be made from teh problem

f(x)=1(0.5)^(x/5.3)

x is the amount of years

plug in 15.9 for x

f(15.9)=0.125

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads