The wind$-$chill index $($in degrees C $)$ is modeled by the function

$W=13\mathrm{.}12+0\mathrm{.}6215T-11\mathrm{.}37v^{0\mathrm{.}16}+0\mathrm{.}3965T{v}^{0\mathrm{.}16}$

where $T$ is the air$-$temperature $(C)$ and $v$ is the wind speed $(k\frac{m}{h}).$

When $T=18C$ and $v=14k\frac{m}{h},$ at what rate is windchill changing as air$-$temperature increases? $($Round your answers to two decimal places.$)C$ of windchill per $C$ of air$-$temperature

When $T=18C$ and $v=14k\frac{m}{h},$ at what rate is windchill changing as wind$-$speed increases? $($Round your answers to two decimal places.$)C$ of windchill per $k\frac{m}{h}r$ of wind$-$speed