exam Maths Puzzle Numerical Ability

Please help....I'm confused by it being 4th root

all variables represent positive real numbers
provide answer in simplified form

4th root of (5y)/(3x^3)

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exam Other Question

The sum of the squares of two consecutive, positive integers is 85. Find the integers. A conical shaped container is made from a circular piece of paper. It has a base radius of 9cm and a height of 12cm. What is the circumference of the original circle in centimatres?