Question

Ashley has 500 songs in his music player. Every week he adds 10 songs to his collection. How many songs will he have in his music player after 20 weeks? At the end of n weeks, the number of songs is given by the function

Answer 1

500 songs in his music player: + 500
every week he adds 10 songs: 10n (n is how many weeks) 
equation: s = 10n + 500 (s is the total amount of songs)
after 20 weeks? : plug it in
s = (10 x 20) + 500
s = 200 + 500
s = 700
he will have 700 songs in his music player after 20 weeks