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State any restrictions on the variable and then simplify each expression.

 

  1. Note: y cannot be negative.





  2. Note: a cannot be negative.





  3. Note: z cannot be negative.



    Although there is no radical in the final, simplified expression, the restrictions placed on the variable are based on the original expression \(\color{red}{\frac{48\sqrt{z^5}}{-6\sqrt{16z^3}}}\) .