Question 207662
rewrite using fractional exponents 
1.5 sqrt x
5*x^(1/2)
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2. sqrt(with a 4 in the v of the sqrt symbol))x + 3 sqrt(again with a 4 in the v)x
x^(1/4) + 3 x^(1/4) = 4x^(1/4)
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3.(sqrt(with 3 in the v of the sqrt symbol)2 (sqrt(with 3 in the v of the sqrt symbol)ab)
2^(1/3)*(ab)^(1/3) = (2ab)^(1/3)
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4. sqrt[4mn/a^2b^2]
= (2/ab)(mn)^(1/2)
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Cheers,
Stan H.