- Poll: can 2+2=5 ?

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Prove that b1/s(b1) is equal to (r12*sqrt(n-2))/sqrt(1-r12^2). (The two t statistics)? MATH EQUATION help: I took a photo of the problem I need help with. Can someone help break this down for me? Thanks!? How many arrangements of the letters in ORDERED include the word RED? Could a human live to be 200? Is every person atoms reused?