Answer:
17
Step-by-step explanation:
We are given the expression find x + 9 if x = 8.
When a certain number has a variable and the value of the variable is known, all you have to do is plug in the variable amount into the equation, therefore :
x is 8 , so we plug in 8 for x
x + 9 = 
8 + 9 = 17
 
        
                    
             
        
        
        
One cat has four paws, so there are 120/4=30 cats.  If a "set" of cats is two uncool cats and three cool cats, there are five cats in a set, so there are 30/5=6 sets.  Since each of the six sets contains three cool cats, there are 18 cool cats in the family.
        
             
        
        
        
I don’t understand the question
If you mean
7m-4
M=8, this is the solution
7(8)-4
56-4
=52
But if you mean
7m- - 4
As in - + - = +
Then this is your answer
7(8)+4
56+4
=60
        
             
        
        
        
30% percent is what they marked up