Question

What is the sum of a 23-term arithmetic sequence where the first term is 9 and the last term is 97? help ASAP

Answer 1

It's given
\[a_1=9\ \text{( First term)}\]
\[a_{23}=97\ \text{( Last term)}\]
Now Sum of the series Sn is given by the following relation
\[S_n= \frac{n}{2} \times ( a_1+a_{23})\]
n=23
Can you solve now?