add 4n and 5n, which is 9. 9n=-9, and if u divide both sides by nine, n=-1
 
        
                    
             
        
        
        
Answer:
Option D. 2x⁷ - 12x⁶ + 10x⁵
Step-by-step explanation:
From the question given:
Length (L) = 2x²
Width (w) = x³
Height (h) = x² - 6x + 5
Volume (V) =? 
Volume (V) = length (L) x width (w) x height (h) 
V = L x w x h
V = 2x² × x³ × x² - 6x + 5
V = (2x²) (x³) (x² - 6x + 5)
V = (2x⁵) (x² - 6x + 5)
Clear bracket 
V = 2x⁷ - 12x⁶ + 10x⁵
Therefore, the volume of the cube is 2x⁷ - 12x⁶ + 10x⁵
 
        
             
        
        
        
Answer: The system consists of parallel lines
Step-by-step explanation:
Given system of lines :
  
 

Substitute  in
 in  ,  we get
,  we get
 , which is not true.
 , which is not true.
That means , system has no solution.
i.e. they are representing parallel lines. [Parallel lines do not intersect and hence they do not have solution.]
 
        
             
        
        
        
The answer is 3 because 12-9=3
        
                    
             
        
        
        
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