Evaluate:   2^3 + 2^1 + 2^0 + 2^-1 + 2^-2 

2^3 = 23 = 2 * 2 * 2 = 8
2^1 = 21 = 2
2^0 = 20 = 1
2^-1 = 2-1 = 1/2^1 = 1/2 = 0.5
2^-2 = 2-2 = 1/2^2 = 1/4 = 0.25

2^3 + 2^1 + 2^0 + 2^-1 + 2^-2
8   + 2   + 1   + 0.5  + 0.25 = 11.75

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Creator: Gerald Thurman [gdt@deru.com]
Created: 29 December 2009

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