Question

Which answer is the explicit rule for the sequence 11, 8.5, 6, 3.5, 1

Answer 1

`a_n=13.5-2.5n`

Explanation:

`11,\ 8.5,\ 6,\ 3.5,\ 1...`

`So\ d=8.5-11=b-8.5=3.5-6=1-3.5`

`=-2.5`

`And\ a_1=\parallel \left\{Anithmetic\ \left.\ sequence\right\}\right.`

`so\ a_n=a_1+d(n-1)`

`=11-2.5(n-1)`

`=13.5-2.5n`

`The\ answer:a_n=13.5-2.5n`

I hope this helps you

:)

Answer 2

I think it's an= 13.5 - 2.5n