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OpenStudy (anonymous):
87 + 83 + 79 + ... if the sum = -336, how many terms were added?
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OpenStudy (jlastino):
Use the formula for the summation of an arithmetic series S= n/2 (2a + (n-1) d) S=-336 a=87 d=-4 (Since you add -4 to find the next term) Sub values then solve for n Can you solve it from here?
OpenStudy (anonymous):
ohhh! yes I can! Thank you!
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