1) First question

Please note that:

28=4*7=7*2^2

so your expression can be re-write as below:

sqrt(7*2^2*a^4/b^10)

you have to divide all of your exponents by the index of radical, so we have:

(2*a^2/b^5)*sqrt(7)

2) Second question:

I can simplify your radical as below:

x*sqrt(5*y^2)

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