- A couple of math problem I don't know how to solve.?

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A box is to be formed by cutting square pieces out of the corner of a rectangular piece of a 4" by 6" note card? What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? Do humans have 46 chromosomes or 48 chromosomes? Prove that A is dense in X iff A closure equals X. A subset X.?