Question

Find the indicated term of the given arithmetic sequence.

a[1]=45, d=-6, n=8

a. 309
b. -3
c. 3
d. 87

Answer 1

In order to solve for a nth term in an arithmetic sequence, we use the formula written as:

an = a1 + (n-1)d

where an is the nth term, a1 is the first value in the sequence, n is the term position and d is the common difference.

a8 = 45 + (8-1)-6
a8 = 45 + (7)(-6)
a8 = 3