Question 416475
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Hi
Let x and (2x+5)represent the width and length respectively
Question states***
  2(2x+5) + 2x = 58ft
     6x = 48ft
      x = 8ft, the width.  The length is 21ft   (16ft+5ft)
CHECKING our Answer***
  2*21ft  + 2*8ft = 42ft + 16ft = 58ft
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">