The half-life of cesium-137 is 30 years. Suppose we have a 17-g sample.

label Algebra
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schedule 1 Day
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(c) How much of the sample will remain after 61 years? (Round your answer to one decimal place.) 

 g 

(d) After how long will only 4 g of the sample remain? (Round your answer to the nearest whole number.) 
t =  yr
Apr 17th, 2015

A=17e^(-0.023t), t=17, A=11.5 g

4=17e^(-0.023t), t=8 yr

Apr 17th, 2015

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Apr 17th, 2015
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Apr 17th, 2015
Sep 22nd, 2017
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