4.8 is the answer hahehehehehehe sorry jus needs to be this many characters long
        
             
        
        
        
An additive inverse is the value you can add to a given value such that the sum is "0".. 
Your answer is choice A
18xy + (-18xy) = 0   Since these are like terms.. the key here is understanding that like terms must have the same exact variables raised to the exact same powers.  We can add like terms.  We cannot add unlike terms.
        
                    
             
        
        
        
Answer:
C.
15 votes
Step-by-step explanation:
B= votes Billy got
K = votes Keeton got
B = 3K
B+K =20
Substitute the first equation into the second equation
3K + K =20
Combine like terms
4K =20
Divide both sides by 4
4K/4 = 20/4
K =5
Keeton got 5 votes
B = 3*K
B = 3*5
B = 15 votes
Billy got 15 votes
 
        
             
        
        
        
Answer:
   28y^3 -35y^5
Step-by-step explanation:
   = 7y^3(4) -7y^3(5y^2)
   = 28y^3 -35y^5
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The applicable rule of exponents is ...
   (y^a)(y^b) = y^(a+b)
 
        
             
        
        
        
9x⁹ - 90x⁸ - 351x⁷
What do each of these numbers have in common?
They ALL have 9x⁷ in them!
So, divide each one of these by 9x⁷
9x⁹ ÷ 9x⁷ = 9x²
-90x⁸ ÷ 9x⁷ = -9x
-351x⁷ ÷ 9x⁷ = -39
So, factorized completely, it is :
9x² - 9x - 39
~Hope I helped!~