Answer:
the collision caused huge amounts of magma to rise within a few kilometres of the surface of North American...
Answer: central heating system
Solution:
The answer is
Resolution:
They knew that once invoked, the executive benefit would shield Bush from investigations. The Bush Administration invoked executive privileges six times. During each time it had done so, it concerned investigations steaming from the war on terror to meeting with government officials as well requiring members of his team to testify.
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.
