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State the restrictions on the variable for the following radical expressions.

1. \(\sqrt{y} - 2\)
   
   
   
2. \(\sqrt{2w - 3} + 10\)
   
   
   
3. \(\sqrt[5]{2x + 6}\)
   
   
   
4. \(\sqrt{d^2 + 1} - 3\)