HELP How much of a radioactive kind of lanthanum will be left after 120 hours if the half-life is 40 hours and you start with 960 grams?

step-by-step explanation:

this woman was an important writer and propagandist during the american revolution. she was a member of the committee of correspondence (in fact the committee was formed in her home) and was an advisor to many of the revolutionary leaders, including george washington and john adams. who was this revolutionary woman?