Associative
** property I believe.
        
             
        
        
        
(x + 1) x (x - 4). When you check it you will get your original expression.
        
                    
             
        
        
        
Answer:
{xlx > 10}
Step-by-step explanation:
The lowest value of x is about -8, which is greater than negative 10
 
        
             
        
        
        
Answer:
Domain:  all real numbers.  Range:  (-∞, 2000]
Step-by-step explanation:
f(x)=2.5x is a simple "ramp" function, a linear function and a polynomial.  As such, its domain contains "all real numbers."  That value 800 defines the largest value that this f(x) can have:  f(800) = 2.5(800)  = 2000.  
Thus, the range is "all real numbers from -∞ through and including 2000."