exam Maths Puzzle Numerical Ability

In the figure, AB is parallel to CE, AE=12, DE=6, CE=4
What is the length of AB?

a.8
b.10
c.12
d.14

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exam Other Question

my question is find the equation of a line passing through the point (5,-3) that is perpendicular to the line 3x + 4y=24. use slope intercept formula.
thanks a lot
Can you please factor out completely 2x^2+xy-6y^2?