Answer:
 x=17 plz the brainliest! 
Step-by-step explanation:
3x+39=90 
 3x+39-39=90-39
3x=51 
\frac{3x}{3}=\frac{51}{3}
x=17
 
        
             
        
        
        
If it is marked down 25% and 25% equals 25/100 then you simply take 39.59 x 25/100
39.59 x 25/100 = 9.90
and then you subtract that from the original price 
39.59 - 9.90 = $29.69
after it is marked down, the price is $29.69
        
                    
             
        
        
        
Answer:
y=1x
y=0.3x
y=4x
Step-by-step explanation:
 
        
             
        
        
        
Answer:
c cylinder
Step-by-step explanation:
 
        
                    
             
        
        
        
The First Answer Should Be 2 Not Four 
The Second Answer:
12 : x
4 : 21
Cross Multiply 
4x = 252 
x = 63