You can't solve this unless you have numbers to substitute or another equation.
        
                    
             
        
        
        
Answer: Easily A.
Step-by-step explanation: All you have to do is look at the power of the tens. The one that is the least is A. Since none of the other choices are equal to or less than 10^7, A is your answer. In scientific notation, you almost always look at the 10^x first. 
 
        
             
        
        
        
Answer:
5 %
Step-by-step explanation:
1000 g = 1 kg
50 kg = 0.05 kg
0.05 = 5%
Therefore, 50 g as a percentage of 1kg is 5%.
 
 
        
             
        
        
        
Answer:
b
Step-by-step explanation: