Which of the following is the correct formula to find the sum of the finite geometric series below? $\sum_{k=1}^{9} 10\left(-\frac{1}{3}\right)^{k}$ Round your answer to the nearest hundredth, if necessary.
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Step 1: The formula for the sum of a finite geometric series is: $$S_n = \frac{a_1(1-r^n)}{1-r}$$ where $a_1$ is the first term, $r$ is the common ratio, and $n$ is the number of terms. Show more…
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