Music source A charges a monthly fee of $6.25 plus 99 cents per song. Music source B charges a monthly fee of $9.25 plus 79 cents per song.
?
A: Find a formula that gives the monthly cost A, in dollars, of buying songs from Company A as a function of the number n of songs you buy in a month.
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B: Find a formula that gives the monthly cost B, in dollars, of buying songs from Company B as a function of the number n of songs you buy in a month.
?
C: What number of songs purchased will give the same monthly cost for Company A and Company B?
What will be an ideal response?
A: 
?
B: 
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C: The cost is the same if you buy 15 songs per month.
Mathematics
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