8/4 = y/y-x
8y - 8x  = 4y
y = 2x
y = 2 x 4
y = 8
Hope this helps
        
             
        
        
        
Answer:
The datapoint 9.0 ppm is outlier at the 90% confidence level.
Explanation:
The old data has following values 
mean=10.5 mm
standard deviation 0.2 mm
Now the mean of new values is calculated as following

So the value as 9.0 ppm can be considered easily as outlier in  this regard.
 
        
             
        
        
        
D. A solution because it dissolves when mixed with water
        
                    
             
        
        
        
The law of conservation of energy<span>, a fundamental concept of physics, states that the total amount of </span>energy<span> remains constant in an isolated system. It implies that </span>energy<span> can neither be created nor destroyed, but can be change from one form to another.</span>
        
             
        
        
        
It is a chemical change and a physical change