exam Maths Puzzle Numerical Ability

I have to solve thsse problem for X, if it is an inequality I have to express the answer in interval notation. -19<6x+5<35
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Could someone please help me to simplify
(sqrt) 72x^2y^5

Thanks in advance for your help http://img233.imageshack.us/img233/2087/geometrygy6.jpg

Referring to that picture,

1) If AD = 12 and AC = 4Y - 36, Find the value of y. Then find AC and DC.

2) If ED = x +