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Maths Puzzle
Numerical Ability
Find the roots of the quadratic equations using the quadratic formula. Express the roots, if they are not rational, in simplest radicl form.
4x^2 - 12x - 7 = 0
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3=7(h-2)+17 i dont understand how to do this
An airplane flew for 4 hours with a 20-km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.