Saturday

August 2, 2014

August 2, 2014

Posted by **alex** on Sunday, November 11, 2012 at 11:41pm.

I know the answer is 8/3, but how would you solve this using calculus? please help.

- math -
**Steve**, Monday, November 12, 2012 at 12:18amno need for calculus.

the amount left after t hours is

4 (1/2)^(t/12)

when t=8, that is

4 (1/2)^(2/3)

= 2.52

I think the 8/3 = 2.67 answer is bogus. Close, but nowhere near exact. 8 is 2/3 of 12, but that's not how half-lives work.

**Related Questions**

hard math question - When a certain drug enters the blood stream, its potency ...

chemistry - if you start with 100mg of radioactive material that has a half life...

Algebra 2 help... - A half life of a certain radioactive is 36 days. An initial ...

Physical Science - A gram of radioactive material has a half-life of one year. ...

Advanced Math Help! - suppose m(0) milligrams of a drug are put in the blood of ...

Algebra please check my answers - 1) The linear function f(x) contains the ...

Calculas - suppose m(0) milligrams of a drug are put in the blood of an ...

CALCULUS PLEASE HELP!! - suppose m(0) milligrams of a drug are put in the blood ...

linear/exponential - This question involves the half-life formula. In this ...

CALCULUS PLEASE HELP - suppose m(0) milligrams of a drug are put in the blood of...