Answer:




Step-by-step explanation:
Given
See attachment
From the attachment, we have:


First, we need to calculate length LM,
Using Pythagoras theorem:



Collect Like Terms



Solving (a): 


Substitute values for MN and LN


Solving (b): 


Substitute values for LM and MN


Solving (c): 


Substitute values for LN and LM


Solving (d): 


Substitute values for LM and LN


 
        
             
        
        
        
 69 - 3a = 0
69 - 3a (-69) = 0 (-69)
-3a = -69
-3a(/-3) = -69(/-3)
a = 23
hope this helps
        
             
        
        
        
Answer:

Step-by-step explanation:
We need to sum the following two expressions:


expanding the polynomial in the numerator:


This is the most simplified form we can get: 

 
        
                    
             
        
        
        
Answer:
A. 70
Step-by-step explanation:
You can use the transversals and use vertical angles are congruent.