20/100 = 0.20
0.20 * 9 = 1.8 
9 - 1.8 = 7.2 
The sale price of the DVD is $7.20.
 
        
                    
             
        
        
        
Answer:
35
Step-by-step explanation:
x + 55 = 90
x = 90 - 55
x = 35
 
        
                    
             
        
        
        
Answer:
radius of the sphere (r) = 21 units
Step-by-step explanation:
here's the solution : - 
=》

=》

( pi cancel out )
=》

=》

 
        
             
        
        
        
Answer:
61
Step-by-step explanation:
(x2-x1)2 + (y2-y1)2
(5-0)2 + (-3-3)2
25+36= 61 
square root of 61