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I need help, PLEASE!!!!!!

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Which recursive equation represents the pattern?
For 1 sale, an employee earns 1 token.
For 2 sales, an employee earns 8 tokens.
For 3 sales, an employee earns 17 tokens.
For 4 sales, an employee earns 28 tokens.
 Mar 16, 2012

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 #1
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1, 8, 17, 28

differences:
7, 9, 11

f(0) = 1
f(1) = 8
f(x)=2*f(x-1)-f(x-2)+2

f(2)=2*f(1)-f(0) +2 = 2*8-1+2 = 17
f(3)=2*f(2)-f(1) +2 = 2*17-8+2 = 28
 Mar 17, 2012

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