Answer:
How do you find the contour interval on a map?
Explanation:
near Denver might have index contours of 5,000', 5,100' and so on with a contour interval of 20 feet. This means that there would be five "spaces," and four non-index contour lines, between each index contour. Often, index points are given along with index contours.
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.
The most dangerous characteristic of a hurricane is the storm surge because the ocean water rises along with the storm tide.
