Answer:
180 degrees
Step-by-step explanation:
because i said so
 
        
             
        
        
        
A) 3x (you substitute the g equation into the f one by putting it in the x value for f)
b) x (do the same thing, but switch the letters)
        
             
        
        
        
There really isn't a right or wrong answer since this is a prediction but to solve this look at the graph and try to see the pattern