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Posted by **Darwin12** on Friday, December 14, 2012 at 2:34pm.

A. 25 years

B. 24 years

C. 20 years

D. 29 years

- Math -
**Steve**, Friday, December 14, 2012 at 3:27pm(1/2)^(10/x) = .75

x = 24

- Math -
**Mac**, Friday, December 14, 2012 at 3:34pmYou first have to find your rate

.75 = e^ (r)(10)

Then find the time for half- life

.5 = e^ (r from above)(t)

- Math -
**Amy**, Friday, December 14, 2012 at 5:16pmThanks

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