Heres a screenclip of the correct answers:
Hope it helped :)
 
        
                    
             
        
        
        
Distributive Property:  a ( b + c) = (a*b) + (a*c)
b)   x(x + 9) =  x*x + 9*x 
                = x² + 9x    
c)  x² - 18x 
      x² = x * x
   18x  = 18 *x
 G C F = x
Greatest common factor in both the terms is 'x'.Take the common variable from both the terms.
x² - 18x = x*x - 18*x
             = x (x - 18)
             
Standard form.                Factored form
       x²                                     x*x
 x²  +  9x                             x(x +9)
     x² - 18x                           x(x - 18)  
-x² + 10x                             x(-x + 10) = x(10 -x)
-x² - 2.75x                          -x(x + 2.75)
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Sales price of 200 apples = 300
At this price, there was loss of Rs. 100
Means the cost of the apples was 
300 + 100 = Rs. 400
To earn Rs. 100, they should have been sold for Rs. 500