Answer:
3:9=4 
Step-by-step explanation:
That is my answer
please brainliest
 
        
             
        
        
        
X^2 + 4x -21
= (x +7)(x - 3)
hope that helps
        
             
        
        
        
Answer:
20%
Step-by-step explanation:
- Set up a proportion: 
   - Cross multiply, then divide: 280 × 100 = 28000, 28000 ÷ 1400 = 20
 - So, 20% were satisfied with their car
 
I hope this helps!
 
        
             
        
        
        
Answer:
It would be -4
Step-by-step explanation:
a double negative becomes a + sign
So, -10 + 6=-4
 
        
                    
             
        
        
        
The expression for 7(2+9) IS A(B+C) which is distributive property of addition over multiplication.
Only two arithmetic procedures are subject to the commutative property: Multiplication and Addition
  A + B = B + A Which is Commutative property of addition
 A.B = B.A, which is a commutative property of multiplication.
Distributive property is A(B+C) =AB+AC
 The operation on numbers that are available in brackets can be distributed for each number outside the bracket, according to the distributive property. It is one of the mathematical properties that is used the most. Commutative and associative qualities are the other two important features.
from the given data 7(2+9) =7*2+7*9
                                                 =14+63
                                                 =77
 Now, we can clear that 7(2+9) =7(9+2) 
Hence, the expression for commutative property of addition is A(B+C) = AB+AC.
To learn more about commutative property, visit 
brainly.com/question/28387735
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