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Unformatted text preview: 13 b. x 2 = 4 2 + 2 2 + 6 2 + 1 2 = 57 c. (x) 2 = (13) 2 = 169 d. (x1) = (41) + (21) + (61) + (11) = 3+5+1+0 = 9 19. a. x = 3+4+2+6 = 15 b. y = 2+1+3+4 = 10 c. xy = (3*2) + (4*1) + (2*3) + (6*4) = 6+4+6+24 = 40 20. a. x + 3 or (x) + 3 b. (x  2) 2 c. x 2 10 or (x 2 )  10...
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 Fall '07
 Lewin

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