21. Which of the following set of integers is arranged in descending order? A. 15, 10,5, 0, -5.-10.-15 C. 15, 10, 5, -15, --15, -5,0 B. 15, 10,5, 0, -15, -10,-5 D. 15, -15, 10, -10,5. -5,0
22. Determine two rational numbers between which 150 lies A. 12 and 13 C. 14 and 15 B. 13 and 14 D. 15 and 16
23. Which of the following equations illustrates the associative property of addition? A. 5+3 = 3 + 5 5+ 3 = 3 + 5 C. (2) () = 1
B. 0 + (-7)=-7 D. (6 + 8) + 4 = 6 + (8 + 4)​