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OpenStudy (anonymous):
PLEASEE HELP MEEE!:/ What is the sum of the arithmetic sequence 149,135,121,..., if there are 28 terms? a. -1,204 b.-1,176 c. -1,148 d. -1,120
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OpenStudy (anonymous):
keep subtracting 14 i think
OpenStudy (anonymous):
i did but then it become negative & gets lower:/ get me?
OpenStudy (anonymous):
the ancer is D -1220
OpenStudy (anonymous):
answer
OpenStudy (marigirl):
yes D i the answer
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OpenStudy (marigirl):
S = (n/2) × (2a + (n-1)d) This is the formula s=(28/2)*((2*149)+(28-1)*-14)=-1120
OpenStudy (marigirl):
sorry n stands for the number of terms in the sequence, a- first term d- difference
OpenStudy (anonymous):
thank you so much!
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