To determine which online retailer charges the least amount to buy and download 8 songs, we need to calculate the total cost for downloading 8 songs from each retailer.
Online Retailer A: The cost for multiple songs isn't specified in your message, so we cannot calculate it.
Online Retailer B: According to the provided information:
- The cost per song: $1.25 for the first song, increasing by $0.25 for each song.
- 1 song: $1.25
- 2 songs: $1.50
- 3 songs: $1.75
- 4 songs: $2.00
- 5 songs: $2.25
- 6 songs: $2.50
- 7 songs: $2.75
- 8 songs: $3.00
So the total cost for 8 songs = $3.00.
Online Retailer C: The equation for the cost, \( y = 0.35x + 1.5 \), can be used to calculate the cost for 8 songs (where \( x = 8 \)):
- Cost for 8 songs = \( 0.35(8) + 1.5 = 2.8 + 1.5 = 4.3 \). So, the total cost for 8 songs = $4.30.
Online Retailer D: They charge a flat rate of $0.60 per song.
- Cost for 8 songs = \( 8 \times 0.60 = 4.80 \). So the total cost for 8 songs = $4.80.
Summary of Costs:
- Online Retailer B: $3.00 for 8 songs
- Online Retailer C: $4.30 for 8 songs
- Online Retailer D: $4.80 for 8 songs
Conclusion: Online Retailer B charges the least amount to buy and download 8 songs at $3.00.
The correct response is: Online Retailer B.