Answer:
Vertical Angles are when angles opposite each other when two lines cross, they are ALWAYS equal. Their measurements are always the same.
Step-by-step explanation:
 
        
             
        
        
        
Very likely...... I assume
        
                    
             
        
        
        
Answer:
a
Step-by-step explanation:
solve for m. ;)
 
        
             
        
        
        
This looks one hundred percent correct to me and to check your answer you can plug in the answer you find to the first equation 
17=37+4f 
17=37+4(-5)
17=37-20
17=17 
great job!!