I NEED THIS ASAP Which phrase describes the element carbon-14?

decays at an unknown rate
found in an organism’s remains
forms from the breakdown of nitrogen-14
is measured to determine the age of sedimentary rocks

Brazil trades with the united states more than it does with any other country. industrially, the private sector has made brazil one of the most advanced countries in latin america, with massive investment taking place since 1996. still, over 1 million people live in state-owned housing and millions more are covered by government operated health care. these facts show that brazil has a a) mixed economy. b) market economy. c) command economy. d) traditional economy.