A dilation is a transformation that changes the size but not the shape of a figure. Therefore, the image created by the dilation is not congruent to the pre-image, the original figure; it is similar. Each point of the image is distinguished from those of the pre-image by using a prime symbol.
        
             
        
        
        
It's scientific notation, so 1.4x10^7 would be 14000000 <span />
        
             
        
        
        
No. of people don't like to be teacher
 = 100% - 75% = 25%
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So, 15 number of students doesn't like to be teacher