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ABCD is a square and E,F are the midpoint of sides AD,DC respectively. show that BE,AF are perpendicular? Bet 50.00 at -155 odds wins what is the pay out? For what value of K, is 16a^2 + 24ay + K a perfect square ? Please help !? Do fats have surface tension? Why or why not? Hi . we know this equal (NH2)2CO + CaCl2 + H2O = CaCO3 + NH4Cl
is this caco3 hydrated?

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