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    Finding the First Term and Common Difference of an Arithmetic Series

    Homework Statement The sum of the first 4 terms in an arithmetic series is -8 and the sum of the first 5 terms is 85. Determine the first term and the common difference. Homework Equations tn = a + (n-1)d Sn = n/2 (2a + (n-1)d) The Attempt at a Solution