The cost to purchase a song from itunes is $0.99 per song. to purchase a song from napster membership fee is $10. in addition, each purchased song cost $0.89. how many downloaded songs, d, must be purchased for the monthly price of napster to be same as itunes?

Step-by-step explanation:

Itunes : 0.99 per songlet d represent the number of songs

so the expression for this is : 0.99d

Napster : 10 bucks + 0.89 per song

this expression would be : 10 + 0.89d

so if u want to find out when they will be the same, set them equal to each other and solve for d

0.99d = 10 + 0.89d

0.99d - 0.89d = 10

0.10d = 10

d = 10 / 0.10

d = 100so 100 songs must be purchased <===

check it...

itunes :                                   napster :

0.99(100) = $ 99                 10 + 0.89(100) = 10 + 89 = $ 99

it checks out :)

answer: since the question is talking about growth you have to use the growth formula which is inital amount (1 + growth)^time

step-by-step explanation:

the intial amount is 1200, the growth is 4.8, and the time is 7. plug those numbers into the equation, also i think you have to change 4.8 into a percent. but, i have forgotton how to do that. if this is a online class go on to the lesson.