equilibrium expression for the combustion of octane?

Question

My project is due today =/ (it's 1:30 now, and I really need someone to clarify this last one question. Thanks!
This is what I got for the combustion of octane. ^denotes a superscript/exponent.

[H2O]^18[CO2]^16
-----------------
[C8H18]^2[O2]^25

Thanks! Please respond as QUICKLY as possible

Answer 1

please? I'm going to have to leave it like this =/