exam Maths Puzzle Numerical Ability

solve the equation:x-3-sq.root of x+2=0.thank you.

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An airplane took 2.5 hours to fly 625 miles with the wind. It took 4 hours and 10 minutes to make the return trip against the same wind. Find the wind speed and the speed of the If R=8, A=16, W=18, what is the formule for A to Z?