Mark M. answered • 12/12/20
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-86 = 1 + (n - 1)(-3)
-87 =- -3n + 3
-90 =- -3n
30 = n
Zara J.
asked • 12/11/20how many terms are in the finite sum?
1 + (-2)+ (-5)+(-8)+...+(-86)
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