X 0 y was 30
 at x 12 y is about 55
12-0 = 12
55-30 = 25
25/12 = 2.08 inches per year average
 so answer should be D
 
        
             
        
        
        
I think it is 88 not sure though
        
                    
             
        
        
        
Answer:
The diameter is 13.88 feet.
Step-by-step explanation:
 1. The formula for calculate the volume of a sphere is:
 
 Where  is the radius.
 is the radius. 
 2. The diameter is:
 
 3. So, you must solve for the radius in the first equation:
 ![r=\sqrt[3]{\frac{4V}{3\pi}}](https://tex.z-dn.net/?f=r%3D%5Csqrt%5B3%5D%7B%5Cfrac%7B4V%7D%7B3%5Cpi%7D%7D) 
 
 ![r=\sqrt[3]{\frac{4(790.272ft^{3} )}{3\pi}}\\r=6.94ft](https://tex.z-dn.net/?f=r%3D%5Csqrt%5B3%5D%7B%5Cfrac%7B4%28790.272ft%5E%7B3%7D%20%29%7D%7B3%5Cpi%7D%7D%5C%5Cr%3D6.94ft)
 4. Then, the diameter is:
 
 
        
             
        
        
        
Let's take the percentage as x
(x / 100) * 5 = 0.35
x / 100 = 0.07
x = 7
therefore the percentage is 7%