An initially empty cylindrical tank with a diameter of 19 m is being filled with oil at a steady rate of 13.6 cubic meters per second. simultaneously, oil is also being drained from the tank at a constant rate of 4.2 cubic meters per second. how fast is the fluid level in the tank changing, in centimeters per second, after 7 seconds have passed?

  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-

i'm pretty sure it is letter c.) car

the answer to this question is 3.