Basically there are 3 addition properties and they are associative property, identity property, and commutative property. 
Commutative property is just changing the order of the addends. Example: 26+19+34+21= 21+34+19+26
Identity Property is just adding a 0 to the number that doesnt change anything. Example: 26+19+34+21 +0 = 100
Associative property is just changing the grouping of the addends. Example: (26+19) + (34+21) 
        
             
        
        
        
The answer is C. 
To solve these types of equations you first need to make sure that you equation is equal to 0. In this case all of the numbers are already on the same side so no work needs to be done there. Then we can get a, b and c values for the quadratic equation by looking at the coefficients. 
a = 4 (number attached to x^2)
b = -6 (number attached to x)
c = 1 (number with no variable attached)
Now we can put this into the quadratic equation. 


 
 
        
        
        
Answer:
slope: -3
y-intercept: 5
Step-by-step explanation:
y=mx+b, where m=slope and b=y-intercept
 
        
                    
             
        
        
        
The answer is <span>f(x) = sin pi over 215x
I just took the test</span>
        
                    
             
        
        
        
Answer:
45
Step-by-step explanation:
Lemme know if this helped