Posted by **HM** on Tuesday, September 27, 2011 at 10:20am.

a certain radioactive isotope has a half life of approx 1,300 years .

How many years to the nearest year would be required for a given amount of this isotope to decay to 55% of that amount.

So I am not sure where to put the 1,300

1,300=2600*e^t

or A=x*e^1300

## Answer this Question

## Related Questions

- Math - a certain radioactive isotope has a half life of approx 1,300 years . ...
- MATH help - a certain radioactive isotope has a half life of approx 1,300 years...
- MATH help - a certain radioactive isotope has a half life of approx 1,300 years...
- college - a certain radioactive isotope has a half life or 850 years.how many ...
- Calculus - My teacher wants me to use this formula for half life question C(t...
- Math - D.E.Q. - The half-life of a radioactive isotope is the amount of time it ...
- Chem - The decay constant for a radioactive isotope is 7.82 x 10-6 /y. What is ...
- Chemistry - The isotope caesium-137, which has a half life of 30 years, is a ...
- Chemistry - Gallium65, a radioactive isotope of gallium, decays by first order-...
- Math - How do I solve this if there is no equation to this 1. The population of ...

More Related Questions