Find the indicated term of the sequence. $\begin{array} { l }
a _ { n } = ( - 1 ) ^ { n } ( 6 n - 5 ) \
a _ { 15 } =
\end{array}$
A)85
B)-92
C)-85
D)-84
E)95

Question

Find the indicated term of the sequence.  $\begin{array} { l } 
a _ { n } = ( - 1 ) ^ { n } ( 6 n - 5 ) \
a _ { 15 } =
\end{array}$  
A)85
B)-92
C)-85
D)-84
E)95

Quizplus · Accepted Answer

To find the 15th term, $a_{15}$, substitute $n = 15$ into the given formula: $a_{15} = (-1)^{15} (6(15) - 5)$. Since $(-1)^{15} = -1$, the calculation becomes $-1 \times (90 - 5) = -1 \times 85 = -85$.

Find the Indicated Term of the Sequence an=(−1)n(6n−5)a15=\begin{array} { l } a _ { n } = ( - 1 ) ^ { n } ( 6 n - 5 ) \\a _ { 15 } =\end{array}an​=(−1)n(6n−5)a15​=​

Find the Indicated Term of the Sequence $\begin{array} { l } a _ { n } = ( - 1 ) ^ { n } ( 6 n - 5 ) \\a _ { 15 } =\end{array}$