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Mathematics 14 Online
OpenStudy (dumbsearch2):

Given t1 = -23, n = 25, and tn = 57, find the sum of the arithmetic series. A. 125 B. 250 C. 325 D. 425

OpenStudy (dumbsearch2):

@zarkon @sammixboo

OpenStudy (michele_laino):

Please try this formula: \[S = \frac{{{t_1} + {t_n}}}{2}n\]

OpenStudy (michele_laino):

where S is your sum

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