exam Maths Puzzle Numerical Ability

Hello,
I am having a hard time finding domains. For example:
f(x) = 1/x-2? This makes no sense to me. Please help.

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exam Other Question

Simplify.

(2m to the 3rd power n)to the 4th power(3m to the 4th power n squared)squared
Find each product. #58

(3y - 13)(y - 3)