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Lina20 [59]
3 years ago
15

assume the substance has a half-life of 11 years and the initial amount is 126 grams.How long will it be until only 15 % remains

?
Mathematics
1 answer:
Mumz [18]3 years ago
5 0
(126) times (1/2 to the x/11 power) = 15% times 126

(1/2) to the x/11 power = 0.15

Take the log of both sides :

(x/11) times log(1/2) = log(0.15)

Multiply both sides by 11 :

'x' times log(1/2) = 11 x log(0.15)

Divide both sides by " log(1/2) " :

x = 11 x log(0.15)/log(1/2) = <em><u>30.107 years</u></em> (rounded)

That's the time it takes for <em><u>any-size</u></em> sample of this substance
to decay to 15% of its original size.


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