Question 864337
This section done was based on misreading part of the descrption:
Length is unknown, x.
{{{cross(12*x=324)}}}
{{{cross(x=324/12)}}}
{{{cross(x=27)}}}
Perimeter is {{{cross(2(27+12))=39*2=highlight(78)}}}



THIS part is good:
Do everything in one unit or the other.  Here, FEET is chosen.
x is the unknown length;
width is <b>1 foot</b>.
{{{1*x=324}}}
{{{x=324}}} FEET length.
Perimeter is {{{highlight(2(1+324)=2*325=highlight(650))}}} feet.