exam Maths Puzzle Numerical Ability

PLEASE HELP!!!!

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2/3x^4 - 1/3x^2y + a/2x^p

Thank you so much!

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exam Other Question

-x/3+y/2=1 Science and medicine. A plane flies 720 mi against a steady 30-mi/h headwind
and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane�s speed in still air?