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OpenStudy (anonymous):
Help! Find s25 for the following arithmetic sequence -7,-2,3,8,...
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sam (.sam.):
You know how to apply the formula \[\LARGE S_n=\frac{n}{2}[2a_1+(n-1)d]\]?
sam (.sam.):
you gotta find d
sam (.sam.):
and d is just -2-(-7)=5
sam (.sam.):
n will be the number 25, and \(a_1\) is the first term, -7 subsitute in and evaluate
OpenStudy (anonymous):
s(25)=25/2(2(-7)+25-1)5?
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OpenStudy (anonymous):
s(25)=625?
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