Answer: -5-13i
Work Shown:
(1-4i) - (6+9i) = 1-4i-6-9i
(1-4i) - (6+9i) = (1-6) + (-4i-9i)
(1-4i) - (6+9i ) = -5 - 13i
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Since the two triangles are congruent, all their angles are as well. 
So you can set 4y-10 = 3y+5 since they are the same angles.
Now solve the system by putting the y's on the left side and coefficients on the right side:
y=15. 
 
        
                    
             
        
        
        
Well, to cover the whole bridge, is 6/6, or 1 whole
so hmmm   

 
 
        
        
        
The answer is 
4 hope it helps