book Maths Puzzle Numerical Ability

an airplane took 2 hours to fly 600km against a head wind. the return trip with the wind took 1 2/3 hours. find the speed of the plain in still air.

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Find the domain of f, the roots of f (x) = 0, and determine the signs of f where f (x) = x^2 -1/ square root of x + 1 + square root or x + 1 - Thank you for any help you can give Find the y intercept for the function y=4^x.