Set this up as
10 = 40 (1/2)t/28
and solve for t in years.
10/40 = (1/2)t/28
log(0.25) = (t/28) log(0.5)
t = 28 log(0.25) / log(0.5) years = 56 years
Test the answer:
56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.
Picture please ? So I can see how to answer this
The ozone layer is comprised of ozone, an atom which is constructed of 3 oxygen molecules.
Hope that helped =)
C. The majority of jobs today are in the service industry.
I believe the correct answer from the choices listed above is the second option. In the summer, temperatures exceed 100 f, whether it's a cloudy day or clear day. The seasonal weather condition expressed here is the summer. It <span>is the hottest of the four temperate seasons, falling between spring and autumn.</span>
