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OpenStudy (anonymous):
What is the sum of a 22–term arithmetic sequence where the first term is 56 and the last term is –28? Answers: 252 280 308 336 PLEASE HELP!
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OpenStudy (waleed_imtiaz):
Its simple @mother123 ..... U know the formula to sum up the arithmetic sequences...... Sn=n/2[a1+an]...... now a1=56 and an=-28. and n=22...... Put the values and U will get the answer,,,,,, Try this.....
OpenStudy (anonymous):
okay hold on let me try! thankyou!
OpenStudy (anonymous):
308?
OpenStudy (waleed_imtiaz):
yes... 308
OpenStudy (anonymous):
thankyou so much!
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OpenStudy (waleed_imtiaz):
My pleasure @mother123
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