If a sample contains 50 grams of carbon 1-4 and 50 grams of nitrogen-14, how many half lives has it undergone

What were some passive/non-direct ways that enslaved africans did to resist slavery?

Which best describes the purpose of the south carolina exposition and protest, which was written by john c. calhoun? a) to explain why the south was nullifying the tariff of 1828 b) to describe the ways the tariff of 1828 would southerners c) to persuade northern states to rebel against the federal government d) to ask england for if the south decided to secede from the union

Why did separate government develop in ancient greece?