Let L be the length of the rectangular dog run.
The perimeter of a rectangle is twice its length plus twice its width, so Sari needs 2*L + 2*8 = 40 feet of fencing.
Thus, 2*L = 40 - 2 * 8 = 40 - 16 = <<40-2*8=24>>24
Therefore, the length of the rectangle is L = 24 / 2 = <<24/2=12>>12 feet. Answer: \boxed{12}.
Sari is creating a dog Run in her backyard. She has 40 feet of fencing to go around the outside, and she wants to make it rectangular with a width of 8 feet, what will the length be, in feet?
1 answer