Answer:c)21 
Step-by-step explanation:
i just took the quiz
 
        
                    
             
        
        
        
Answer:
$360. (I believe so, anyways.)
Step-by-step explanation:
 Original Price x Discount % / 100
Discount = 600 × 40/100
  24000/100
$600 - $240
Final Price = $360
 
        
             
        
        
        
Answer:
 N=250
Step-by-step explanation:
  "twice as many nickels as dimes"     means    N =2D     [eq1]
  "collection of nickels and dimes is worth $25"    means
         5N + 10D = 2500      [eq2]
    (To avoid using decimal points, PLZ express everything in cents.)
 
Substitution   (substitute N from eq1 into eq2]:
      5(2D) + 10D = 2500
       10D + 10D = 2500
           20D = 2500
             D = 125
 
       N=2D         [eq1 again]
       N=2(125)
       N=250
 
Check:
   Is   5(250) + 10(125) = 2500   ?
         1250 +  1250 = 2500   ?
           2500 = 2500   ?yes
 
        
             
        
        
        
Answer:
its either d or a
Step-by-step explanation:
 
        
             
        
        
        
Answer:
No idea sorry we have not learned this yet