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Find the explicit formula for the geometric sequence $c_n$ given below. Note that $c_1 = 9$.
$9, -\frac{9}{4}, \frac{9}{16}, -\frac{9}{64}, \frac{9}{256}, ...$
Select the correct answer below:
$\circ c_n = 9(-\frac{1}{4})^n$
$\circ c_n = 9(-\frac{1}{2})^n$
$\circ c_n = -\frac{1}{4}(9)^n$
$\circ c_n = -\frac{1}{4}(9)^{n-1}$
$\circ c_n = 9(-\frac{1}{2})^{n-1}$
$\circ c_n = 9(-\frac{1}{4})^{n-1}$
