D. 2(n-8) 
The difference of a number and eight is separate from being multiplied by 2 which is why you would use parenthesis.
        
             
        
        
        
Answer:
12 days
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
6
Step-by-step explanation:
(x + 9) * (x - 2) = 60
x^2 - 2x + 9x - 18 = 60
x^2 + 7x - 18 = 60
x^2 + 7x = 78
FACTORING:
x(x + 7) = 78
x = 6
 
        
             
        
        
        

bear in mind that, though the square has two valid roots, one negative and one positive, the hypotenuse is just a radius distance, and therefore is never negative.
 
        
             
        
        
        
Using the slip and slide method:
2x^2+5x-12
x^2+5x-24
(x+8)(x-3)
(x+8/2)(x-3/2)
(x+4)(2x-3)
Final answer: (2x-3)(x+4)