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Algebra
Question

Find the sum of the first $$9$$ terms of the following sequence. Round to the nearest hundredth if necessary.

$$75 , 72 , 69.12 , \ldots$$

Sum of a finite geometric series:

$$S _ { n } = \frac { a _ { 1 } - a _ { 1 } r ^ { n } } { 1 - r }$$