exam Maths Puzzle Numerical Ability

How do I solve this problem by factoring. 6x^2 + 42x=0

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exam Other Question

how do you work out the percentage of an area on a pie chart? I want to know how to get the exterior, interior, EVERY Angle of a Triangle. What if 3 triangles are on the same plane, and they are intersecting...what are all the angles?! THANKS