What is the explicit equation for the following geometric sequence? 18, 9, 4.5, 2.25,...

a
\large a_n=\left(18\right)2^{n-1}

b
\large a_n=\left(18\right)-2^{n-1}

c
\large a_n=\left(18\right)-\frac{1}{2}^{n- 1}

d
\large a_n=\left(18\right)\frac{1}{2}^{n-1 }

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i dony know

step-by-step explanation:

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.

26

step-by-step explanation: