Answer:
A. No, this is not a valid inference because he asked only 20 families 
Step-by-step explanation:
You cannot assume that those are the only families that would want to go; you have to ask all the families.
 
        
                    
             
        
        
        
Here is your answer 
Given area is
z^2 + 18z + 81
= z^2 + 2× z × 9 + 9^2
[using (a+b)^2= a^2 + 2ab + b^2], we get
= (z+9)^2
we know that area of a square is represented by side^2.
So, here
Side of square is

HOPE IT IS USEFUL 
 
        
                    
             
        
        
        
The circumference of the circle is about 25.12 inches. Hope it help!
        
             
        
        
        
Answer: y = -4
Step-by-step explanation:
y = 4x-6
y = 4(1/2)-6
y = 2-6
y = -4
 
        
                    
             
        
        
        
Answer:
4
Step-by-step explanation:
There are 4 board members and 3 committee members. You can solve this using combinations:
4C3 = 4!/(3!(4-3)!) = 4!/(3!1!) = 4
You can also solve this by recognizing that since there is one fewer committee spot than there are board members, there will be one possible committee excluding each of the 4 board members.