exam Maths Puzzle Numerical Ability

g(x)=x=5;h(x)=x-5 , are these functions inverse if so, why?

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My least favorite because I do not understand these:(
What is the focal point of 1/3(y-2)=2(^-x+5)





6. Translate to an algebra statement; do not solve:
Three times the difference of five and a twice a number yields the same result as the same number increased by four.