<span>d = 20 inches 
r = d/2 = 20/2 = 10 inches 
Area = πr^2 
= 22/7 * 10^2 inch^2 
= 2200/7 inch^2 
= 314.2 inch^2 
Therefore, Answer is B. 314.2 in^2 Ans</span>
        
                    
             
        
        
        
Answer:
213 in base 4 = 124 in base 5
Step-by-step explanation:
First we convert base 4 to base 10
213 in base 4 
2*42 + 1*41 + 3*40
32 + 4 + 3
39 in base 10
Now we convert base 10 to base 5
 39/5  
 7/5  r = 4
 1	r = 2
124 in base 5
Hence 213 in base 4 = 124 in base 5
 
        
             
        
        
        
Substitute -2 in for x and get (9)^-2
Flip the equation so that the exponent is positive and get 1/9^2
Work it out 1/(9*9) = 1/81
        
             
        
        
        
To figure this question out, I recommend the FOIL method. 
F: First
O: Outer
I: Inner
L: Last
Statement A is true. IH and AG in the FOIL method is the Outer.