Jean has $280 in her savings account. Starting next week, she will deposit $30 in her account every week.
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It is a cap-size parabola. The parabola "goes down". The graph of this function looks like in this attached picture.
We can employ a simple repeated decimal trick:
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Alternatively, we can compute the partial sum of the series.
As , the second term vanishes and we're left with
. Notice that this is really just a more formal version of the earlier trick.