Evaluate
\frac{7\sqrt{5}}{400}\approx 0.03913119
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\frac{7\sqrt{5}}{80\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{7}{80\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{7\sqrt{5}}{80\times 5}
The square of \sqrt{5} is 5.
\frac{7\sqrt{5}}{400}
Multiply 80 and 5 to get 400.
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