exam Maths Puzzle Numerical Ability

find the inverse of the one-to-one function f(x)=(3sqrtx-6)

a)f^1(x)=x^3+6
b)f^1(x)=x+6
c)f^1(x)=1/x^3+6
d)f^1(x)=x^3+36

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Can anyone help me with the steps and solution to this problem?

Simplify each expression using the definition of zero exponent

-4^0 - 8^0

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2(x+2)^0