12. What are the fourth roots of 81 and which is the principal root? A. Square roots are *3 and - 3. The principal root is *3. B. Square roots are *9 and -9. The principal root is *9. C. Square roots are - 3 and *9. The principal root is - 3. D. Square roots are *3 and -9. The principal root is -9.



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