- Which hydrocarbons?

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If you write 70,000 in scientific notation the coefficient will be 70 true or false? What are the laws of probability? 100 Ah battery how many hours to be backup for 100 watts load? What are the coordinates of the vertex of the parabola represented by the equation y= −5x2 + 30x−25 ? I'm trying to find a way to get my grades up in maths and I don't know how to focus on just studying does anyone know how to help?