3.5
−2.46
1.16 error aligning the decimal point.
Do this instead
3.50
- 2.46
1.04
We'll say beginning amount is 100
Ending Amount = Beginning Amount / 2^n where n is the number of half-lives
100 hours mean six and 2/3 half-lives will elapse
Ending Amount = 100/2^(6.666666)
Ending Amount = 100 /
<span>
<span>
<span>
101.59
</span></span></span>Ending Amount =
<span>
<span>
<span>
0.9843488532
</span>
</span>
</span>
So if we started with 100 grams after 100 hours (or 6.6666666 half-lives) we would only have <span>
<span>
0.9843488532
</span>
grams remaining.
http://www.1728.org/halflife.htm
</span>
Answer: -1° is the average for all 5 days
A = pi r^2 / 2
if 22mm = radius
then
A = (3.14 * 22^2) / 2
A = 759.88
if 22mm is the diameter
then
A = (3.14 * 11^2) /2
A = 189.97