Answer:
C: isolate the x squared by using inverse operations 
Step-by-step explanation:
This method of solving quadratic equation is used when there is only x² term and no x term. Thus;
For example, we have a quadratic equation;
x² - 1 = 80
To solve this by square root method, the first step we have to take is to isolate the x² term by inverse operation which is by addition of 1 to both sides to get rid of the -1 on the left side so that x² can be isolated. 
 
        
             
        
        
        
B hope this helps. Hope helps
        
                    
             
        
        
        
Answer:
the correct answer is , 4(20+3)
Step-by-step explanation:
 
        
             
        
        
        
The hexagon divides the circle into 6 parts. That means the angle projecting each side is: 360°÷ 6 = 60° 
The area of a circle is: πr² 
78.54 in² divided by pi is 25 making the radius = 5 
I would then use SOH CAH TOA to solve for the side.. knowing the hypotenuse is the radius and the angle to split it into a right triangle is 30° 
Sin(30) = s/5 
5*Sin(30) = s 
12*s = perimeter hexagon
(remember s is half the hexagon side) 
12*5*Sin(30) = perimeter hexagon 
30 inches  = perimeter 
 
        
             
        
        
        
40 Why? 80%x X=50 or 80/100x X=50