Question

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

Answer 1

A.
`\bold{a_n=-3\cdot\left(\frac18\right)^(n-1)}`

Explanation:

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