Answer:
Step-by-step explanation:
(1). A = π r² 
A = 4 π 
Area of shaded region is  =
 =  or
 or  
 
(2). C = 4 π 
In this case, the length of the bigger arc and the area of shaded region happen to be the same. 
The length of the arc ADB is   or
 or  
 
 
        
             
        
        
        
Answer:
23.7
Step-by-step explanation:
 
        
             
        
        
        
Answer:
-2
Step-by-step explanation:
To answer this, just take the negative reciprocal of 1/2.  We obtain -2.
 
        
             
        
        
        
1 + 1x
OR
1 + x
They mean the same thing! Hope this helps!
 
        
                    
             
        
        
        
     n² - 4n = 0
n(n) - n(4) = 0
    n(n - 4) = 0
n = 0    or    n - 4 = 0
                     + 4 + 4
                        n = 4 
Solution Set: {0, 4}