Question

Not really sure what to do here??

Answer 1

`d=-6`

`a_9=-49`

Explanation:

If the first term of a sequence is
`-1` and the second term is
`-7`, then each successive term in the sequence is
`6` less than the previous term. The common difference is
`-6` (
`d=-6` ).

The formula representing the arithmetic sequence is:

`a_n=-6n+5`

Therefore, the ninth term in the sequence is:

`a_9=-6(9)+5`

`a_9=-54+5`

`a_9=-49`