Nature, for the most part, is unpredictable. I would say it would be fairly impossible for humans to know weather accurately 100% of the time anytime in the future.
Hope this helps!
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Answer:
21.5%
Explanation:
to find the answer to this equation you must found out how much each of the areas are
the circles area is represented by pi*(5^2)
that is 25pi
or
25 * pi = 78.5398163
then you find the area of the square
10 * 10 = 100 (5 + 5 = 10)
you can directly subtract 78.5398163 from 100 because it can be portrayed as 100%
100 - 78.5398163 = 21.4601837
you must round to the nearest tenth so your answer is
21.5%
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.