1. (1 pt) Calculate the flux, F, and concentration change, $\frac{\partial C}{\partial t}$, for a one-dimensional concentration distribution described by: $C(x) = a + bx$ if the diffusivity of the chemical in the medium increases in the $x$-direction as: $D(x) = D_0 + gx$. $D_0$, $a$, $b$, and $g$ are positive constants.