You have to solve by Using

N=N0(1/2) t/h

You have to solve by Using

N=N0(1/2) t/h

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Redmond, WA

Diana here N=20, N0=100, t=18, making the final equation to solve 20/100= .5^(18/h)

Take the log of both sides- log .2=(18/h)*log .5

H=18*log .5/log .2=7.752 hours

HOpe that helps!

Deanna

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