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A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? How many edges in a circle? How many milliliters of concentrated of sulfuric acid (18 M) are required to make 7.0 L of 0.12M H2SO4? Discrete Help ASAP. Please write out symbolic notation.?