What is the question? no question has been asked. need more info to solve.
        
             
        
        
        
One form of the relation of inverse variation is y = k/x.
first step:  Find the value of k:    Taking the values x=5 and y = 4, 4=k/5, or k=20.  Then,   y = 20/x.
Next:  Let y = 7 and find the corresp. value of x:  7=20/x, or 7x=20, or
x = 20/7    (answer) 
        
                    
             
        
        
        
Answer:
 or
 or 
Step-by-step explanation:
we know that
Applying the law of cosines

In this problem we have

c is the length of the third side
Substitute




 or
 or 
 
        
             
        
        
        
Answer:
b = 29.0, A = 123.9°, C = 20.1°
 
        
                    
             
        
        
        
The answer is option (c) 7xy^2-2xy^2