Australian Aborigines are sacred to the Uluru ( Ayers rock ) since 1872.
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.
Answer:
A lack of food and water
Explanation:
In a region with a low crude birthrate, a high crude death rate is most likely indicative of <em>a</em><em> </em><em>lack</em><em> </em><em>of</em><em> </em><em>food</em><em> </em><em>and</em><em> </em><em>water</em><em>.</em><em> </em>This is because without food and water, people can die, thus causing a high crude death rate. Food and water is necessary for survival.
<em>PLEASE DO</em><em> </em><em>MARK ME</em><em> </em><em>AS BRAINLIEST</em><em> </em><em>IF</em><em> </em><em>MY ANSWER</em><em> </em><em>IS HELPFUL</em><em> </em><em>;</em><em>)</em><em> </em>