Question

Check my answer? General formula for nth term?

Answer 1

I got D

Answer 2

\[\begin{align}
\sf\text{geometric series} : a_n = a_1r^{n-1} \\
&: ~ a_5 = a_1r^{n-1} \\
&: \frac{1}{8} = a_1 \left(\frac{1}{2}\right)^{5-1} \\
&: \frac{1}{8} = a_1\left(\frac{1}{2}\right)^4 \\
&: \frac{1}{8} =a_1\left(\frac{1}{16}\right) \\
&: \frac{1}{8} \cdot 16=a_1 \\
&:~ a_1 = 2
\end{align}\] Plug your value in to the general format for a geometric series with:\[a_1 = 2~,~ r=\frac{1}{2}\] And you'll have your answer,

Answer 3

Oh so its A then? @jhannybean

Answer 4

yes ;)

Answer 5

as it is as a form \( a_n = a_1r^{n-1} \)

Answer 6

thank you so much

Answer 7

ur welcome ;) but pay close attention to the solution