11 feet I think, hope this helps
Answer:

Step-by-step explanation:
<u>Step 1: Determine the area of the black area</u>



<u>Step 2: Determine the area of the entire white and black area</u>



<u>Step 3: Determine the difference to just get the white area</u>


Answer: 
Answer: 2 is not a function because 1 has no unique image
Step-by-step explanation:
Well, it's a parabola. I use this web page a lot, it's an online graphing calculator. I think it shows the works sometimes as well. Good luck!
Math Papa: https://www.mathpapa.com/algcalc4/?utm_expid=69051716-34.8dopvBQ6T1mUbi-6f1C3Fg.5&utm_referrer=https...