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.
I think the answer is B. Geographers use different kinds of maps, depending on the subject they are studying. <span />
Answer:
No dinosaur fossils are found above the Cretaceous Paleogene boundary.
Explanation:
Answer:
true, and <u>NAFTA</u> has a cool flag.
Explanation:
look it up
Answer:
1, 3 and 5 are true.
Explanation:
A smaller planet doesn't have the gravity to hold and atmosphere (with oxygen) or water. A larger earth would hold a thicker atmosphere, which would contain more ammonia and methane.
