Question

Colby loves to download new music. He originally had 34 songs but plans to purchase 6 new songs each week. He wants to know how many songs he will have after 100 weeks. Which equation should he use?

a100 = 34 + 6(100 + 1)
a100 = 34 + 6(100 − 1)
a100 = 100 + 6(34 − 1)
a100 = 100 + 6(34 + 1)

Answer 1

2nd one

a100 = 34 +6(100-1)

Answer 2

Week # of Songs
1 34
2 34 + 6
3 34 + 6*2
4 34 + 6*3
...
n 34 + 6*(n - 1)

100 34 + 6* (100 - 1)

Answer: second option