Question 351918
The perimeter of a rectangle is,
{{{P=2L+2W=26}}}
{{{L+W=13}}}
.
.
.
{{{L=1+2W}}}
Substitute,
{{{(1+2W)+W=13}}}
{{{1+3W=13}}}
{{{3W=12}}}
{{{highlight(W=4)}}}ft
Then 
{{{L=1+2(4)}}}
{{{L=1+8}}}
{{{highlight(L=9)}}}ft