- Factor 2x^+7x-4?

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How much heat is produced by the complete combustion of 270 g of CH4? CH4(g)+2O2(g)→CO2(g)+2H2O(g)ΔH∘rxn=−802.3kJ? Write an equation for the precipitation reaction that occurs when solutions of potassium hydroxide and nickel(II) bromide are mixed.? Please help with this and explanation with answer would really help? What's the equation of a circle with the centre C(3,4) that has a mutual point with the line 2x - y + 5 = 0 ? Does anyone know how to verify that a magnifying glass is a certain X?