Final answer:
The formula for the partial sum of an arithmetic sequence provides a way to find the sum of the first n terms. To find the value of a specific term in the sequence (an), we can rearrange the formula.
Step-by-step explanation:
The formula for the partial sum of an arithmetic sequence is:
Sn = n/2(a1 + an)
To solve this formula for an, we can rearrange it as follows:
an = 2(Sn/n) - a1
where Sn is the sum of the first n terms, a1 is the first term of the sequence, and an is the nth term of the sequence.