Question 134459
simplify 1/2 of the square root 28 
= (1/2)sqrt(28)
= (1/2)*2Sqrt(7)
= sqrt(7)
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simplify the squareroot of 4000x squared y
= sqrt(4000x^2y)

= sqrt(400x^2*10y)

= 20x*sqrt(10y)
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Cheers,
Stan H.