- How long have we known what stars are and what were ideas previous to that knowledge?

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A particular light bulb uses 75 joules of electrical energy to produce 45 joules of light energy. What is its efficiency? Is collagen can inhibit blood clotting? What is chastened? How many grams of NH4Cl must be added to 0.100 L of 0.361 M NH3 to produce a buffer solution with pH= 9.52 ? pKa (NH4Cl) = 9.24 2 Decimals? Find all points c satisfying the conclusion of the Mean Value Theorem for the function f(x)=−sqrt(3)cos(x)−sin(x) and interval [0,2π].?

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