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Alchen [17]
3 years ago
8

HELP ASAP!!!!!!!!!!!!!

Mathematics
1 answer:
Paladinen [302]3 years ago
3 0

Answer:

<h3>              A.   \bold{a_n=-3\cdot\left(\frac18\right)^{n-1}}</h3>

Step-by-step explanation:

\begin{cases}a_1=-3\\a_n=a_{n-1}\cdot\dfrac18\end{cases}\\\\\\a_2=a_{2-1}\cdot\frac18=a_1\cdot\frac18\\\\r=\dfrac{a_2}{a_1}=\dfrac{a_1\cdot\frac18}{a_1}=\dfrac18\\\\\\a_n=a_1\cdot r^{n-1}\\\\a_n=-3\cdot\left(\frac18\right)^{n-1}

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