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help!!!! I know the answer for #22 is -2730 but I don't know how to get it?

help!!!! I know the answer for 22 is -2730 but I don t know how to get it? class=

Verified Answer :

wolf1728

You are to sum 
-1 2^1
-1 2^3
-1 2^5
-1 2^7
-1 2^9
-1 2^11

which equals
-2
-8
-32
-128
-512
-2,048

which totals -2,730


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