It’s c
The reason is you just multiply all the numbers together to get 1170cm^3
        
                    
             
        
        
        
Answer:
8x^3-7x^2-11x+9
Step-by-step explanation:
(8x^3-5x-1)-(7x^2+6x-10)
remove unnesasary ( )
8x^3-5x-1 -(7x^2+6x-10)
the distribute 
8x^3-5x-1 -7x^2-6x+10
combine like terms 
8x^3-11x+9-7x^2
use the communative property to reorder the equation
8x^3-7x^2-11x+9
 
        
             
        
        
        
To simplify rational expressions, simply see and check if there is a common number or same number that can be divided from in both. If not here, you would simply multiply the numbers together. 
Then simplify if you would need to. 
It would be 85x/6
        
             
        
        
        
Divide across and just bring down the numbers
        
             
        
        
        
Your reasoning is correct, but you made a mistake with your long division.
1248/98 = 12 remainder 72
       __12_
98 |  1248
        -  98
        --------
           268
          -196
         --------
              72
Final Answer:  13 is minimum number of showings