Sarah is creating a dog run space in our 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 lengths be in feet?

Answer 1

Let L be the length of the dog run space.
The total perimeter of the rectangular space is L + 8 + L + 8 = 2L + 16 feet.
Since Sarah has 40 feet of fencing, we have the equation 2L + 16 = 40.
Subtracting 16 from both sides, we get 2L = 24.
Dividing both sides by 2, we get L = 12 feet.
Therefore, the length of the dog run space is 12 feet. Answer: \boxed{12}.