Answer:
40
Step-by-step explanation:
11x+13=90
11x=77
x=7
49-9=40
 
        
                    
             
        
        
        
1) The scale factor for the dilation is 2/3. 
2) The polygon became smaller after the dilation because you are multiplying by a scale factor less than 1.
3) The ratio of the areas is 2/5.