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January 25, 2015

January 25, 2015

Posted by **Anonymous** on Saturday, March 13, 2010 at 11:25pm.

m(t) = 70e-0.0274t

Find the half-life of thorium-234. (Round your answer to the nearest tenth.)

- math -
**Reiny**, Saturday, March 13, 2010 at 11:27pmyou would be solving

35 = 70 e^-.0274t

.5 = e^-.0274t

-.0274t = ln(.5)

t = ln(.5)/-.0274

= 25.297

half life is appr 25.3 years

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