Question

Use the following recursive formula to answer the question.

a1=−3/2
an=an−1+1/2

What is a9?

Answer 1

I'm pretty sure the answer to

a1=−32

an=an−1+12

is 5/2

Answer 2

2 1/2

Explanation:

Each term is 1/2 added to the previous term. The first term is -3/2, so the first 9 terms of the sequence are ...

-3/2, -1, -1/2, 0, 1/2, 1, 1 1/2, 2, 2 1/2

a9 is 2 1/2.