Find the distance from

$(4,7,9)$

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