B. Perfect square 3. What is the principal root of 289 ? A. 14 B. 15 C. 16 4. What is the positive fourth root of 4 096? A. 8 B. 9 C. 10 5. Which of the following is NOT a rational number? B. 0.16 A. C. 2 100 6. Which of the following is the principal root of-16