exam Maths Puzzle Numerical Ability

Prove that ((AC)^2/(BC)^2)=(AD/BD) In right triangle ACB (C is the right angle) with CD as an altitude (D is between A and B)

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exam Other Question

Tell wether the ordered pair is a solution of the linear system.

(1,-1);
2x - y = 3
4x + 2y = 2

Any help with this equation would be Greatly</b> appreciated.
How do I express the answer to the following inequality in interval notation?

(y-3)/3> 1/3-(y-5)/6