(i)[2]
Find the equation of $n$, and give your answer in the form $ax + by + cz = d$.
(ii)[3]
Calculate the perpendicular distance between $m$ and $n$.
(iii)[4]
The line $l$ is in plane $n$, passes through $P$ and is perpendicular to $OP$, where $O$ is the origin. Find a vector equation for $l$.
(c(iii))[4]
The line $l$ lies in plane $p$, passes through $P$ and is perpendicular to $OP$, where $O$ is the origin. Find a vector equation for $l$.