It would be -3. since they’re different signs you would subtract instead of doing addition. you also would us the greater numbers sign, which, in this case, -9 is the greater number so the answers sign would be negative.
        
                    
             
        
        
        
Answer:
check the screenshot I attached:
 
        
             
        
        
        
Answer:
they are identical. proved below.
Step-by-step explanation:
- formula:   
using the formula to proof:



True. proved that they are identical.