Question

$4 \\ - - \\ \sqrt{20}$
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Answer 1

$\frac{4}{ \sqrt{20} } = \frac{4}{ \sqrt{20} } \times \frac{ \sqrt{20} }{ \sqrt{20} } = \frac{4 \sqrt{20} }{ \sqrt{40000} } = \frac{4 \sqrt{20} }{20} = 0.89$