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OpenStudy (anonymous):
What expression defines the artmetric series 15+25+35+... for seven terms?
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OpenStudy (anonymous):
as we can see 25-15=35-25=10(common difference)its an arithmetic series a,the first term=15,so 7th term,a7=15+(7-1)*10 =15+60 =75
OpenStudy (anonymous):
sum to 7th term, S7 =(7/2)*(a7+a)=(0.5)*(75+15)*7=(0.5)*(630)=315
OpenStudy (anonymous):
|dw:1375725097265:dw|So the would be
OpenStudy (anonymous):
Nice job!
OpenStudy (anonymous):
thanks
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