Find the distance from $(2,-9,7)$ to each of the following.

$($a$)$ the $xy-$plane

$$

$($b$)$ the $yz-$plane

$$

$($c$)$ the $xz-$plane

$$

$($d$)$ the $x-$axis

$$

$($e$)$ the $y-$axis

$$

$($f$)$ the $z-$axis

$$