exam Maths Puzzle Numerical Ability

What is the domain for y=logbase2(3x-6)?
Is it :
a)x is greater than 0
b)x is greater than or equal to 0
c)x is greater than 2 OR
d)x is greater than-2

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exam Other Question

please help me factor the following trinomial

16x^2+40xy+25y^2

Thank you for your help.
what is the scientific notation for 135,000?