The quadratic formula is -b plus minus the square root of b^2-4ac all over 2a.
Here, a=1, b=13, and c=30.
The only option that fills in the values correctly is D
        
             
        
        
        
Lets get started :)
The First question:
Diameter = 20 ft
Radius = 

 of 20 (diameter) = 20 ft
Area formula of a circle is
A = 

r²
    =

(10)²
    =100

 ft²
    ≈ 314 ft²The answer will be the second optionThe Second question:
radius of circle = 12mm  divided into 20 sectors area
A = 

r²
   = 

(12)²
   = 144

 ft²
Divide into 20 equal sector areas = 
 ≈ 22.6 mm²Your answer will be the third option
≈ 22.6 mm²Your answer will be the third optionThe Third Question:
90°, sector area = 36

 , Radius = ?



 and 

 cancels out
We can now cross multiply
360 × 36 = 90r²
12960 = 90r²
Divide by 90 on either side

144 = r²
Take squareroot  
 x = 12 inYour answer will be the third option
x = 12 inYour answer will be the third option
 
        
        
        
x=-y/3 +9 i believe that should help you
 
        
             
        
        
        
Step-by-step explanation:
They are equal because when we flip or reflect ABC onto DCB we are going to have the same size and the same shape