7. State the restrictions on /(•*) _£_+3_ 2x h-6 S. Express as a power of 4. -6sJ 2xV 9. Simplify, stating your answer using positive exponents: l „ { 10. Write (16a)4 in radical form. 11. Simplify completely: 12. Simplify: 2V3+V27 i 3. One solution to the equation cos0 = 0.9848 is