SOLUTION: whats the sum of the first 29 terms of the following sequence: -9, -3, 3 . . .

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Question 725115: whats the sum of the first 29 terms of the following sequence:
-9, -3, 3 . . .
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
-9 -3 3 9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99 105 111 117 123 129 135 141 147 153 159
Now add them all together the first 4 cancel out
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