Evaluate
18\sqrt{5}\approx 40.249223595
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\frac{90\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{90}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{90\sqrt{5}}{5}
The square of \sqrt{5} is 5.
18\sqrt{5}
Divide 90\sqrt{5} by 5 to get 18\sqrt{5}.
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