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To determine the sum of an arithmetic series, you can use a few different strategies.
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Primarily, one of these two equations up here.
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In order to use these, you need to know your first value in the series, your nth value or your final value in the series, the number of values in the series, and your rate of change, which will be the same since it's an arithmetic sequence.
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Now, you might also need to use some iteration of this equation here, which is an equation.
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That allows you to calculate the nth value in the series.
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And for this problem with finding the sum of that given series, we first need to identify what we know, and we know our first term, our last term, and the rate of change...