exam Maths Puzzle Numerical Ability

Hello, my name is Lacey and I was given some homework problems that have me completely stumped. If you could help, that would be fantastic!

So, the problem is as follows:

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exam Other Question

does the inverse of f(x)= 3/x-9

become f^-1(x) = 3+9x/x
what do you call polygons in which all sides have the same length?