The half-life of carbon-14 is 5,730 years. how many grams of parent material will remain from a 200-gram sample after 3 half-lives?
100
50
25
12.5

The answer to your question is 25 grams

Explanation:

Data

half-life = 5730 years

sample = 200 g

after 3 half-lives

Process

Calculate the amount of sample after one, two and three half-lives.

After each half-life, that of sample is half the previous amount.

                         Number of half-lives           Amount of sample

                                       0                                        200 g

                                        1                                         100 g

                                        2                                          50 g

                                       3                                           25 g

the answer is option a.