exam Maths Puzzle Numerical Ability

If I dove from a 30 foot diving board into a pool and went 27 feet into the water. What is the total distance I traveled?

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Hi,
Can you help me with this math problem?

16.) Find the inverse of the function.

f(x)=log(x+9)

The answer should be f-1(x)=10^x-9
(x^4)^-1/4/x^1/4