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Maths - MODULUS HELP!

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    I am trying to complete a few questions on The Modulus Function but I don't know how to answer them because I don't know what they mean.

    The questions are as follows:

    The function 'F' is defined for all real values of X by f(x) = |2x-1|+4.

    I have to evaluate ff(0), solve the equation f(X)=100 and the function g is defined by g(x)=|2x-1|+4 for X<0 and I have to find An expression for g^-1 (X).

    All help is appreciated!

    Thanks in advance!


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