exam Maths Puzzle Numerical Ability

find the domain

y=1/sqrt x-1

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exam Other Question

Decide whether or not the functions are inverses of each other..

f(x)=6x^2+5, Domain [0,Infiniti); g(x)=sqrt of (x-5)/(6), domain [5,Infiniti)

I believe they are??? Am I correct? The electricity costs of a business decreased from $12,000
one year to $10,920 the next. What is the rate of decrease?