If you triple the height of a barrel the dimensions will triple i belive.
        
             
        
        
        
50%, if you put it into a calculator 25/50 gives you .50, move decimal 2 times to the right to get 50.
        
             
        
        
        
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. 
 
        
             
        
        
        
X^2 + 50
√x^2+ √50
x + 5√2
5√2 = ~7.07106
x + 7.07106 
x = -7.07106
hope this helps