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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 140, 133, 126…, if there are 33 terms? 689 896 924 782
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OpenStudy (slaaibak):
Tn = a + (n-1)d T1= 140 = a d = 133 - 140 = -7 T33 = 140 + 32*-7 = -84 Sum = n/2(first + last) = 16.5(140 - 84) = 824
OpenStudy (slaaibak):
Sorry, mistyped that, it's 924
OpenStudy (anonymous):
Thank you
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