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OpenStudy (anonymous):
What is the sum of a 17-term arithmetic sequence where the first term is 7 and the last term is -105?
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OpenStudy (anonymous):
A.-833 B.-893 C.-913 D.-943
hartnn (hartnn):
the formula for sum, given 1st and last term will be \(S_n =(n/2)[a_1+a_n]\)
hartnn (hartnn):
here, n= 17 , a17 = -105 , a1 =7 just plug in values!
OpenStudy (anonymous):
still dont understand
hartnn (hartnn):
i gave you formula, gave you values, you just need to plug in and calculate S
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OpenStudy (anonymous):
still dont understand but thanks anyway .
OpenStudy (anonymous):
is it B ?
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