exam Maths Puzzle Numerical Ability

f(x)=2x-4, find f^-1(x)

This is the hardest one so far.

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Can I have some help with a study guide question?

A large solar hearing panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or (x^7-x^5)(x^3-4)