Evaluate
1920\sqrt{10}\approx 6071.573107523
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640\times 3\sqrt{10}
Factor 90=3^{2}\times 10. Rewrite the square root of the product \sqrt{3^{2}\times 10} as the product of square roots \sqrt{3^{2}}\sqrt{10}. Take the square root of 3^{2}.
1920\sqrt{10}
Multiply 640 and 3 to get 1920.
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