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OpenStudy (anonymous):
What is the sum of a 22-term arithmetic sequence where the first term is 55 and the last term is -29?
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OpenStudy (anonymous):
the formula for this is S = (n/2)[ a + l] in this case n = 22, a = 55 and l = -29
OpenStudy (anonymous):
so 286?
OpenStudy (anonymous):
11 * 26 = 286 yep
OpenStudy (anonymous):
thanks
OpenStudy (anonymous):
yw
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