Thank you for the opportunity to help you with your question!

Here are my answers:

sqrt means square root

2. (-sqrt(7a^5*b))(-11sqrt(42a^6*b^13) =

= 77*sqrt(6*a^11*b^14)

= 77a^5*b^7*sqrt(6a)

3. by expanding factors and multiplying, answer = -9/sqrt(2q) - 21/2

4. sqrt(108wz^8/6w^7z^5) =

= sqrt(18w^(-6)*z^3)

= 3w^(-3)*z*sqrt(2z)

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