9. What are the two square roots of 441 and which is the principal root? A. Square roots are -21 and 22. The principal root is -21. B. Square roots are +21 and -22. The principal root is -22. C. Square roots are +21 and -21. The principal root is +21. D. Square roots are +22 and -22. The principal root is +22. 10. Which of the following is NOT a perfect square? A. 1 B.4 C. 8 D. 100 11.Given below are examples of irrational numbers EXCEPT A. V5 C. not repeating decimals B. 3.1416... D. non-terminating decinals​