The temperature at the perit $(x,y,z)$ is given by $T(x,y,z)=20e^{x^{2}3y^2-2^2},$ where $T$ is measured in $C$ and $x,y,z$ in meters. Find the exact rate of change of the temperature at the point $P(2,1,3)$ in the Airection of the point $(4,4,9).$ Indule whits in your answer. Then get a lecimal aper$-$ximation of your mower to write a simple sentence to interget what your anower means in this context.