it is 10 because you have to set up an equation to get the answer
 
        
             
        
        
        
Answer:
Studies point out that almost 70 percent of the South American continent is made up of hydrographic basins with naturally navigable rivers, which provide real opportunities to become a strategic factor that favors the transportation of merchandise, economic revitalization, and in general, a comprehensive development
Explanation:
 
        
             
        
        
        
Hello
The best answer is B
Have  a nice day
        
             
        
        
        
The property that distinguishes the thermosphere most is the presence of C. Heat
        
                    
             
        
        
        
the economy of Japan is a highly developed and market-oriented economy. It is the third-largest in the world by nominal GDP and the fourth-largest by purchasing power parity (PPP). ... Due to a volatile currency exchange rate, Japan's GDP as measured in dollars fluctuates widely.
so the answer would be C. it is sa highly developed economy