The half-life of the element is 13 minutes, which means after 13 minutes, any starting amount decays to half. So element X decays with a rate k such that
Solve for k :
Now, we solve for t such that
Answer: -9
18/x = -2
⇔ x = 18/(-2)
⇔ x = -9
Step-by-step explanation:
ANSWER :
<u>Percentage = 50%</u>
(if it odd <em>and</em> even then its 100%)
The formula for this is
A = P(1 + r/100)^n where P = initial investment, r = compound interest as per cent, and n = number of years.
so here we have
A = 12000(1 + 1.5/100) ^ 2 = 12000 * 1.015^2 = £12,362.70