TMUA Official Specimen Paper 2 · Question 6

The area of a rectangle is measured to be $5600\,\text{cm}^2$ correct to 2 significant figures.

The width of the rectangle is measured to be $80\,\text{cm}$ correct to the nearest centimetre.

Which one of the following expressions gives the least upper bound for the height of the rectangle?

70.5\,\text{cm}

75\,\text{cm}

\dfrac{5650}{85}\,\text{cm}

\dfrac{5650}{80.5}\,\text{cm}

\dfrac{5650}{75}\,\text{cm}

\dfrac{5650}{79.5}\,\text{cm}

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