5 + 5(-2) + 5(-2)² + ... + 5(-2)? = $\sum_{i=1}^{9} (\frac{1}{4})^i = $
Added by William J.
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5 + 5(-2) - 5(-2)7 + 15(-2)8(2) = 5 + (-10) - (-10)(7) + (-30)(16) Show more…
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