Answers

2016-06-27T20:37:31+08:00
-15 - - - - - 3 A1= -15 N =7 An=3 3 = -15 +( 7-1) d 3 = -15 + 6d Additive inverse 3= -15 +6d +15 18= 6d Divided by 6 d= 3 common difference -15 + 3 = -12 -12 + 3 = -9 -9 + 3 = -6 -6 + 3 = -3 -3 + 3 = 0 And that's it 0 + 3 = 3
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