For Exercises 45–50, write out the first three terms and the last term. Then use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum.
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Identify the sequence: The given expression is an arithmetic sequence where each term is given by .
Write out the first three terms: Substitute into to find the first three terms.
Find the last term: Substitute into to find the last term.
Use the formula for the sum of an arithmetic sequence: , where is the number of terms, is the first term, and is the last term.
Calculate the sum: Substitute the values of , , and into the formula to find the sum of the sequence.
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