Hi There!
Step-by-step explanation and Answer:
21 * 0.2 = $4.2 (Discount)
21 - 4.2 = $16.8 (Sale Price)
Hope This Helps :)
 
        
                    
             
        
        
        
Answer:
   17°
Step-by-step explanation:
Let x represent the measure of the angle.
   (90 -x) = 5 + 4x . . . . the complement is 5° more than 4 times the angle
   85 = 5x . . . . . . . . . . add x-5 to both sides
   17 = x . . . . . . . . . . . . divide by 5
The measure of the angle is 17°.