Which of the following correctly uses the explicit formula, An = 1/4 + (n - 1) x 1/2, to find the 9th term of the described arithmetic sequence?
A. 4 1/4
B. 4 3/4
C. 8 1/4
D. 8 3/4
To find the 9th term of an arithmetic sequence using the explicit formula, we can substitute n = 9 into the formula.
Using the formula An = 1/4 + (n - 1) x 1/2, we have:
A9 = 1/4 + (9 - 1) x 1/2
A9 = 1/4 + 8 x 1/2
A9 = 1/4 + 4
A9 = 4 1/4
Therefore, the correct answer is A. 4 1/4.