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What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? After you prove that two triangles are congruent, what would CPCTC be useful for? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? If the radius of the circle is increased by 6percent the area of the circle is increased by what percentage? Discuss briefly the recruitment process?