1. Use the table above. Scientists find a piece of wood that is thought to be from an ancient fire circle. They find that the wood contains an amount of carbon-14 (14C) that is approximately 1/16 of the current atmospheric 14C levels. 14C has a t1/2 of 5,750 years. (5 pts)How many half lives is represented by 1/16? How many years ago was the tree chopped down to be used for firewood?If you started with 1,000,000 carbon-14 atoms, how many atoms would remain in the wood? Please help, don't send some obscure link, thanks so much!
I attached the chart

u i forgot the answer?

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-