Hi there! This is basic multiplication, if 1 inch equals 25 miles than 2 inches equals 50 miles. To get this answer all I did was multiply 25 by 2 to get the answer of 50 miles.
        
                    
             
        
        
        

So, Option C is the correct answer. 
Hope this will help you.  
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Answer:
5 students
Step-by-step explanation:
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9 students
30% ends up being .3%, multiply .3% by 30 students which equals 9.
        
                    
             
        
        
        
Answer:
s=25
Step-by-step explanation: