book Maths Puzzle Numerical Ability

I need to know the symbols that is used to show the relationship between 2 intersecting lines. I know if the lines (AB and DC) are parallel the answer would be AB // DC, but what

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factor the quadratic expression completely, and find the roots of the expression.

20x^2 + 13x + 2 a test solution of gasohol contains 60L of gasoline and 15L of alcohol. How much pure alcohol must be added so that the resulting solution is 25% alcohol?