Question 876955: Can someone please help me?
1. Find the sum of each arithmetic series.
Part I: -15 + -3 + 9 + 21 + 33 + 45 + 57 + 69 + 81 + 93
Step 1: The formula for the sum of an arithmetic series is , where Sn is the sum of the terms in the series, n represents the number of terms in the series, a1 is the first term in the series, and an is the nth term in the series.
Find the value of each of the following:
a1 =________, an = ________, and n = ________. (1.5 points; 0.5 points each)
Step 2: Use the formula to find the sum. Show your work.
Answer by josgarithmetic(39618)   (Show Source):
You can put this solution on YOUR website! Just this much help:
The common difference is 12, and the term at index 1 is -15.
You can either derive yourself the formula for sum of an arithmetic sequence or look for the formula in your book chapter.
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