Question

Which of the following equations could be used to solve for the tenth term of the following sequence?

15, 13, 11, 9, ...

A. A(10) = 15 + 10(-2)

B. A(10) = 15 + 9(-2)

C. A(10) = 15 + 9(2)

D. A(10) = 15 + 10(2)

Answer 1

B. A(10) = 15 + 9(-2)

Answer 2

The \(n^{th}\) term of an arithmetic sequence is given by the formula:
\[
a_n = a_1 + (n-1)d.
\]Here, n = 10, \(a_1 = 15\), d = -2. Plug them in.