I don't quite understand half-life. How to solve this question?

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- June 1st 2010, 12:38 PMyidaQuestion about geometric series
I don't quite understand half-life. How to solve this question?

http://www.mathhelpforum.com/math-he...56ygrthbrh.jpg - June 1st 2010, 01:54 PMskeeter
- June 1st 2010, 02:27 PMyida
the answer is wrong

- June 1st 2010, 03:54 PMskeeter
- June 1st 2010, 03:58 PMyida
I use y0=55

t=12 h=7.2

but I got wrong answer - June 1st 2010, 04:01 PMskeeter
what "wrong answer" did you get?

- June 1st 2010, 04:04 PMyida
55(0.5)^(12/7.2)

- June 1st 2010, 04:07 PMskeeter