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Mathematics 19 Online
OpenStudy (iwanttogotostanford):

H

OpenStudy (brainzonly):

21 add 9 each time

OpenStudy (kevin):

first number = -15 the difference = -6 - (-15) = 9 Un = a + (n - 1)b Un = -15 + (n - 1)9 Until this, you can simplify it and got your answer

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