exam Maths Puzzle Numerical Ability

Determine the domain of the function f(x)=2x/x-1

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I am confused as to what system to use on this problem When an owner spent $2000/month on ads and the revenue was 120,000 How much do the owner spend if the revenue was 180,000.00 Can someone please help me answer this problem?
The function KE(v)1/2kv^5, given that k is a constant, is an example of power function.
True or False.
I'd really appreciate the