Mathematics, 01.07.2019 22:30 elizabethhubbe
Which equation should be used to calculate s9 for the arithmetic sequence an=3n-1 o s9=9/2(2+26) o s9= 9/2(4+17) o s9=9/4(2+26) o s9=9/4(4+26)
Answers: 2
.
, ......[1]
is the first term and 
is the last term.
or
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Which equation should be used to calculate s9 for the arithmetic sequence an=3n-1 o s9=9/2(2+26) o s...
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