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OpenStudy (anonymous):
What is the sum of a 30–term arithmetic sequence where the first term is 71 and the last term is –103? a –384 b –448 c –480 d –416
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OpenStudy (cwrw238):
formula is (n/2)[a + l] where a = first term n = number terms and l = last term
OpenStudy (cwrw238):
= 15(71 + -103)
OpenStudy (cwrw238):
= 15 * -32
OpenStudy (anonymous):
So, C Thanks!
OpenStudy (cwrw238):
yep yw
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