What is the answer to this problem?

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Find the sum of the first 25 terms of the arithmetic sequence: 7,19,31,43,...

May 25th, 2015

We use the formula:  S = a1 + (n-1)d ;  where a1 is the first term, n is the number of terms we want to add, and d is the common difference of the sequence.

S = 7 + (25 - 1)(12) = 7 + 24 x 12 = 7 + 288 = 295

Hope that helps.

May 25th, 2015

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