SOLUTION: A person drinks alcohol at a party. After her last drink, the alcohol level of her blood soon reaches a maximum of 0.28 milligrams alcohol per milliliter of blood. If the half li

Question 859111: A person drinks alcohol at a party. After her last drink, the alcohol level of her blood soon reaches a maximum of 0.28 milligrams alcohol per milliliter of blood. If the half life of alcohol in her blood is 2 hours, how long must she wait before driving at the legal limit of 0.08 milligrams alcohol per milliliter of blood?
All I know is that I have to divide something in half, but I don't know what or how to set up the equation. I think that I would use this equation but I am not sure A=A_0e^rt ? But I am not sure.
Thanks in advance for the help.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Half life usually denotes using an equation with (1/2) as the base.

where

so then

so,

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