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emilymackenzie88
it is adding 9 because if you see that -3 and add until you get you get to 6 and it would be 9 so i would say to just continue until you get to 132
piradii2
Common difference is +9
Initial value is -3
Range of index numbers is 1-16

You can find sum notation of the question by using arithmetic series,
a(n) = a(1) + d*(n-1) = -3 + 9*(n-1) = 9n - 12 is the general term of the series
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