exam Maths Puzzle Numerical Ability Log and Antilog

Solve 2log4 x - log4 9 = 1.

Simplify sqrt5 - 1/sqrt5.

Simplify (-16x^-3y^2/8xy^-4)^-3.

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exam Other Question

THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5.

PLEASE HELP ME LEARN HOW TO EVEN BEGIN THIS PROBLEM.. I DO NOT EVEN KNOW I am not sure if you would use the foil method to answer this question or not.
(2x-y)*2. (*2 means squared)
I am confused on this question. I would really appreciate your help. Thanks