Answer:
16
Step-by-step explanation:
 
        
             
        
        
        
The equation used above is y-intercept form. 
ex. y = mx + b
Whatever is in front of the x is your slope.
Your slope is -3
        
             
        
        
        
Since the sign before the parentheses is a + , we can just remove the parentheses.
<span>5i + (-9 - i) = 5i - 9 - i = -<u>9 + 4i</u></span>
        
                    
             
        
        
        
Answer:
The domain is the first number in each set so like the domain is: 3,5,6,9 
 
        
             
        
        
        
Yes, it is very important otherwise some teachers may count the problem wrong.