book Maths Puzzle Numerical Ability

solve the inequality,state the solution set using interval notation and graph the solution set.
4x^2-8x greater than or equal to 0

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book Other Question

My question is:
9.64 rounded to the nearest thousandth.
would that be 9.6?
Thanks A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If the speed of the wind is 23 mph, what is the speed of the plane in still air?