Please use * to denote mult. here, not "x."  "x" is your variable and cannnot also be a symbol for mult.
f(x)g(x) = 3x^3 - 5x^2.
Now let x = 3:
(f*g)(3) = 3(3)^3 - 5(3)^2 = 81-45 =  36  (answer)
        
             
        
        
        
Answer:
The answer will be 7,-3
Step-by-step explanation:
 
        
             
        
        
        
6 songs
The way to find this answer is to divide 18 by 3, which is six, which means that after every six songs a commercial is played. 
Hope this was helpful and that I explained it correctly. 
        
             
        
        
        
Does this help you at all?
 
        
        
        
Answer:
La próxima pastilla roja será a las 12:00 a.m.
La próxima pastilla amarilla será a las 8:00 p.m.
La próxima pastilla blanca será a las 7:00 p.m.