Answer:
Hence, the equation that represents the number of songs she will have after 104 weeks is:

Step-by-step explanation:
It is given that:
originally had 47 songs but plans to purchase 3 new songs each week. She wants to know how many songs she will have after 104 weeks.
Based on the data we see that:
Initial number of songs she has:

The number of songs she will have after second week is:

After Third week:

and so on:
After 104 weeks she will have:

Hence, option: C is the correct answer.
( This could also be seen as it form an arithmetic progression with initial term as a=47 and common difference i.e. d=3
Hence, the nth term is given by:

)