Answer:
4 pieces 
Step-by-step explanation:
This is because 3 add 1 makes 4 and 8 minus 4 makes 4
 
        
             
        
        
        
Adjacent angles are angles that are side by side (right next to each other).  They share a side.  #7 and 11 are pairs of adjacent angles.
Vertical angles are angles that are directly across from each other.  They are the same angle.  #8 and 9 are vertical angles.
#10 and 12 do not fit either of these descriptions so they are neither.
        
             
        
        
        
B) Associative property of addition. The order has not changed, just the paranthesis
        
             
        
        
        
Your answer is highly correct
        
             
        
        
        
Answer:
"Membership decreased by an average of 6,600 people per year from year 3 to year 5"
Step-by-step explanation:
To get average rate of change from year 3 to year 5, we need to divide the change from year 3 to 5 by 2 (because from year 3 to 5 is 2 years).
THe change is:
83.6 - 96.8 = -13.2
We divide by 2 to get per year average rate of change:
-13.2 / 2 = -6.6
In thousands, that is 6600 decrease.
2nd answer choice is right.