Using the definition of vertical angles you can set up the equation 3x+4=115, when solved you get x=37. Hope this helps!
I think is C or D, but I'm not to sure
Answer:
2000 feet.
Step-by-step explanation:
Let the length of fence need be x feet.
Then we have the equation:
2lx = 19x + 4000
21x - 19x = 4000
2x = 4000
x = 2000.
The answer is an eight sided shape; octagon