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Anonymous
Exactly that. 2n+2.
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3 + 3n = 9 + 2n + 4n n = -2
4n
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1
n= -2
12+4n = 2n12+4n-4n = 2n-4n12 = -2n-1/2(12 = -2n)-6 = n