18. What is the next highest and the next lowest perfect square around 71? A. 36 and 49 B. 25 and 36 C. 49 and 64 D. 64 and 81 19. What is the sum of the first three whole numbers? A. 6 B. 7 C. 14 D. 3 20. It is the union of the set of whole numbers and the set of negative numbers. A. Real B. Natural numbers C. Integers D. Whole numbers numbers 21. What kind of number is = 12.5 ? A. Rational B. irrational numbers numbers C. Whole numbers D. Natural numbers 22. Identify the whole number before and after the rational number 34 A. 4 and 5. B. 7 and 8 C. 2 and 3 D.5 and 6 23. Which of the following numbers is a rational number? A. 242 B. 16 C.V-29 D.2 24. Which of the following is not a subset of rational numbers? A. Whole B. Irrational C. Integers numbers numbers D. Natural numbers 25. What number below is a natural, whole, integer, rational and real number? A. -10 B. 11.2 C. 6 D. 4.7​