If $26 represents the cost of  the 5 used CDs, than your formula would be "26+4x" ,x being the amount of extra CDs you purchase.
The number CDs minus 5 is our x value, because the first 5 are the used CDs bundled into the $26 group.
26+4(6-5)
26+4(1)
26+4
30
6 CDs would cost $30
        
             
        
        
        
The answer is B u put them all in a fraction and put them in simpliest form and all the answers in B come up to 7 over 8
        
             
        
        
        
4/5
just take 16/20 and divde both be 4
        
             
        
        
        
Answer:
 2 and 3   
Step-by-step explanation:
2) If two polygons are similar, the ratio of their areas is equal to the square of the ratio of their corresponding sides. 
side ratio:  1/4-------   area ratio: 1²/4²  =  1/16   = 1:16 ratio
3)If two polygons are similar, then the ratio of their perimeters is equal to the ratios of their corresponding side lengths.
 The ratio of the perimeters is the same as the scale factor.
  scale 1:4