Posted by jay 1 on Tuesday, October 12, 2010 at 8:29pm.
8mg to 0.25 mg means how many half lives.
1 half life = 4 mg remain
2 half lives = 2 mg remain
3 half lives = 1 mg remain
4 half lives = 0.5 mg remain
5 half lives = 0.25 mg remain.
It takes 124 hours for a half life; therefore, it must take 124 x 5 for the 5 half lives.
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