Answer:
67.5
Step-by-step explanation:
 
        
                    
             
        
        
        
$UI$IDE IS THE ONLY OPTION BUDDY. IM SORRY TO BREAK THE BAD NEWS
        
             
        
        
        
Whats the options please?   
        
             
        
        
        
Answer:
Triangle 1 and 3
Step-by-step explanation:
Based on a Congruent rule Side angle side : 
In triangle 1 and triangle 3 are congruent by side angle side .
Therefore, the answer is triangle 1 and triangle 3.
  
        
             
        
        
        
Answer:
<em>Thus, f and g are inverse functions</em>
Step-by-step explanation:
<u>Inverse Functions</u>
If two functions f(x) and g(x) are inverses, then it follows that:

Or:

We are given


Let's test if they are inverse functions:

Simplifying:

Now find:

Operating:

Thus, f and g are inverse functions