Question 974169
let the width of the rectangle be w
now,length of the 
rectangle(L) =2w-1  -----(1)
perimeter of the rectangle
        2(w+L)=34
divide both side by 2,you get
        w+L=17 -----(2)
from (2)
      w=17-w  -----(3)
subsitute for w in (1)
that is, L=2(17-L)-1
     clear the bracket
      L=34-2L-1
Then, L+2L=33
      3L=33
    divide bothside by 3
   3L/3=33/3
   L=33/3
  L=11ft
The lenght of the rectangle is 11ft.
HOPE THIS HELP,..