exam Maths Puzzle Numerical Ability

haveing trouble divideing polynomicals.
3y^3+y^2/y+1

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exam Other Question

i dont understand how to rationalize 5+2^3/7+4^3 .please help me with this sum. thanks! A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 28mph, what is the speed of the plane in still air?