For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxygen and two atoms of hydrogen.
You didn't describe the situation so I can't answer.
However: if the graph of the situation is a straight line then the situation is linear, and if the graph is not a straight line then it is nonlinear.
Answer: 1.98 ft
Step-by-step explanation: 45(.8)^14
8/1 x 2/3 = 16/3. 16/3 = 5 1/3