book Maths Puzzle Numerical Ability

What is the inverse of the equation f(x) = 11x – 4

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book Other Question

Eight couples (husband and wife)are present at a meeting where a commitee of 3 is to be chesen . How many ways can this be done so that the commitee
a)Contains a couple? b)Cantains no couple?
Gracie Lee deposited $20,000 in a savings account at 4% interest compounded semiannually. At the beginning of year 4, Gracie deposits an additional $70,000 at 4% interest compounde