25
The triangle given by 9, unknown, and 15 and the triangle given by 15, unknown, and x are similar triangles and therefore 9:15 = 15:x
X is 25 in this case
        
             
        
        
        
Move the decimal 2 places to the right resulting in the answer 2,380
        
             
        
        
        
The second dot with says x+y=360 y=8x
        
             
        
        
        
 <em>Refer</em><em> </em><em>to</em><em> </em><em>the</em><em> </em><em>attachment</em>
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Andrew made a mistake at last step. 
<u>It should be:</u>
- -11.8 + 9.8 = 9.8 - 11.8 = -2 but not -21.6