Answer:
It is positive. B/c nucleus consists of postively charged particles called Protons, and neutral charged (no charge) particles called neutrons. So it has a net positive charge. 
Explanation:
 
        
             
        
        
        
Turbines. Invented by Charles Parsons. I know I'm in middle school, but we are just learning about hydroelectric power.
 
        
                    
             
        
        
        
Answer:
A (-7)/(1)
Explanation:
(-7)/(-1) would be a positive 7.
7/1 would be a positive 7.
(-7)/(0) would be 0.