If a rock has 500 atoms of a parent and 3500 atoms of daughter product, how many half lives have passed?

1 half life

2 half lives

3 half lives

4 half lives

there is no way to tell

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.