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Mathematics 10 Online
OpenStudy (anonymous):

87 + 83 + 79 + ... if the sum = -336, how many terms were added?

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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