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OpenStudy (anonymous):
Please help! An arithmetic series begins with −8 and ends with 148. The series has a sum of 980. How many terms are in the series?
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OpenStudy (anonymous):
use the formula Sn = n/2 * [a + l] where s = sum,a = first term, and l = last term and solve for n
OpenStudy (anonymous):
correction Sn = sum (=980)
OpenStudy (curry):
14 terms
OpenStudy (curry):
is the answer
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