book Maths Puzzle Numerical Ability

√(32x^7y^2)

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book Other Question

an airplane took 2 hours to fly 600km against a head wind. the return trip with the wind took 1 2/3 hours. find the speed of the plain in still air. could you please show me in which order do you apply the power to?
5y to the 5th power when y = 2

do you times 5 to the 5th power then times by 2 or
do you times 5 x2 then to the 5th power

pl