Question: A closed box has height hcm and a square base of side x cm. It has volume 100 cm. What is the value of

A closed box has height hcm and a square base of side

A closed box has height hcm and a square base of side x cm. It has volume 100 cm. What is the value of x which minimises the surface area of the box? Give your answer in cm correct to 3 significant figures.

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