Can i get a full explanation on how to do this problem? Quantitative Questions

The temperature distribution, at a certain instance in time, across a wall $0\mathrm{.}3m$ thick is $T(x)=$

$a+bx+c{x}^2,$ where $a=200C,b=-200\frac{C}{m},$ and $c=30\frac{C}{m^2}.$ The wall has a thermal

conductivity of $1W{m}^{-1}{K}^{-1}.$

a$.$ What are the fluxes into and out of the wall?

Hint: Flux is obtained from Fourier's Law.