Answer:
The general formula for the terms of an arithmetic sequence is given by:an
a1 + (n - 1) * d
an is the n-th term of the sequence,
a1 is the first term of the sequence,
n is the position of the term in the sequence,
d is the common difference between successive terms.
For example, the first term (a1) is 5, and there is a constant difference of 8 between successive terms (13 - 5 = 8, 21 - 13 = 8,
we can use this formula to find the position (n) of the term with a value of 621 :
621 = 5 + (n - 1)× 8
621 = 5+8n-8
621 = -3+8n
621+3=8n
624 = 8n
n=624/8 =78
the term with a value of 621 is located at position 78 in the sequence.
Explanation: