Evaluate
2\sqrt{155}\approx 24.899799196
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\sqrt{620}
Add 500 and 120 to get 620.
2\sqrt{155}
Factor 620=2^{2}\times 155. Rewrite the square root of the product \sqrt{2^{2}\times 155} as the product of square roots \sqrt{2^{2}}\sqrt{155}. Take the square root of 2^{2}.
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