Question 871889
You did not show the choices but that is not too important.  Here is the solution process, completely in symbols.


p is the perimeter, same as the fencing of 252 feet.
w = width
L = length
{{{L=2w}}} from description
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Goal is solve for L.
{{{2w+2L=p}}}
{{{2(L/2)+2L=p}}}
{{{L+2L=p}}}
{{{3L=p}}}
{{{highlight(L=p/3)}}}