Question

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

Answer 1

I think it's an= 13.5 - 2.5n

Answer 2

Answer:

$a_n=13.5-2.5n$

Step-by-step 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

:)