If you have a 2700 gram sample of c-14 and 12 half-lives have passed how much of your original sample
remains. how much times has passed? _

A ( t )=0.659 gram of C-14

Explanation:

Mathematically exponential decay can be expressed as

where

A ( t )   - the amount left after t years;

A 0  - the initial quantity of the substance that will undergo decay;

t 1/2  - the half-life of the decaying quantity.

Calculation:

Given that

A 0  =2700 gram sample of C-14

t=time=12 times of half life of C-14

Required data:

A ( t )=?

Putting value in the attached equation we get

A ( t )=0.659 gram of C-14

the right answer is c i just did the question.