Question

Please help me, Ive been on this for almost half an hour ;(

which explicit formula describes the sequence −9, −3, 3, 9, 15, …?

Group of answer choices


an = 9n + 6


an = 6n + 15


an = 6n - 15


an = 9n – 6

Answer 1

it's 9n + 6

Step by step :

-9 + 6 = -3

-3 +6 = 3

3 + 6 = 9

9 + 6 = 15