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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 149, 135, 121, …, if there are 28 terms? help pleasee
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OpenStudy (cwrw238):
sum of n terms = (n/2)[2a + (n-1)d] here n = 28, a = 149 (first term), d = common difference common difference = 135 - 149 = -14
OpenStudy (cwrw238):
plug these values in to get your answer
OpenStudy (anonymous):
i got -1120
OpenStudy (anonymous):
thanks
OpenStudy (cwrw238):
14 * (298 + 27(-14)) = -1120 yes
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