Question

Find the recursive formula for the arithmetic sequence −6, 1, 8, 15,...
(1 point)
Responses

a1=−1, an=an−1+7
a1=−1, an=an−1+7

a1=−1, an=an−1−7
a1=−1, an=an−1−7

a1=−1, an=an−1−17
a1=−1, an=an−1−17

a1=−1, an=an−1+17

Answer 1

The common difference is 7, so the recursive formula is
a1 = −6, an = a_{n−1} + 7 for n ≥ 2.