Sunday

April 20, 2014

April 20, 2014

Posted by **Jackie** on Friday, January 25, 2013 at 11:43am.

- math -
**Damon**, Friday, January 25, 2013 at 11:52am1/2 = e^k(11)

ln .5 = 11 k

11 k = -.5978

k = -.05435

so

.15 = e^-.05435 t

-1.897 = - .05435 t

t = 34.9 years

**Related Questions**

Math - assume the substance has a half-life of 11 years and the initial amount ...

calculus - Assume a substance has a half-life of 11 years and the initial amount...

Science - Radioactive substance decays so that after t years, the amount ...

calculus - The rate at which an amount of a radioactive substance decays is ...

Math, science - assume the substance has a half-life of 12 years and the initial...

Math - In 10 years, 25% of a radioactive substance decays. What is its half-life...

precal - If the half-life of a certain radioactive substance is 2000 years, ...

Biology - The half -life of carbon-14 is 5,730 years.how much of an initial ...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

Algebra - In 10 years, 25% of a radioactive substance decays. What is its half-...