book Maths Puzzle Numerical Ability

Let f(x)=x+4/x-3 Find inverse function f^-1(x)

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Solve the following applications.

Two angles are complementary if their sum is 90 Degrees. Find the angles of two complementary angles if the second angle is twice the first. I have to solve each of the following systems of linear inequalities graphically and I cannot figure it out. These are the three inequalities 3x-y is less than/equal to 6, and x is