exam Maths Puzzle Numerical Ability

let f(x)=2x+5and find

(a) f^-1(x) and (b) 1/f(x)

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exam Other Question

The Instructor of an introductory computer course wants to make a wall chart of a computer desktop for her students. To make it as relistic as possible, she would like the desktop Add or subtract as indicated. Express your results in simplest form
x^2/ x -3 - 9/ x -3