I'm almost certain it's C :)
        
             
        
        
        
Answer:
bottom left graph should be correct
 
        
             
        
        
        
(-1, 5) because if you plug in -1 to both equations, you should get 5 from both equations. They also cross at that point, making that the solution.
        
                    
             
        
        
        
B at least 70% i had the same question before and that was correct
        
             
        
        
        
Answer:
sqrt239
Step-by-step explanation:
Using the pythagoream thereom, we know that a^2+b^2=c^2. 
so x^2+17=256
That makes x the square root of 239.