exam Maths Puzzle Numerical Ability

I am having difficulty with functions, can someone please help. Determine which functions are inverse to each other. f(x)=6x, g(x)=x/6, h(x)=6/x
Thank you

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exam Other Question

let f(x)=4-x^ and g(x)=2-x. Find f(x)-g(x) Sharon's revenue R(in dollars) on the sales of x fruitcakes is determined by the fomula R=50x-x^2. Her cost C(in dollars) for producing x fruitcakes is given by the fomula C=2x+40.