1. Comparisons Hold up the ‘+’ card if you think the answer is always positive. Hold up the ‘-’ card if you think the answer is always negative. The ?? Card Hold up the ‘??’ card if you cannot tell based on the given information (cannot be determined).

2. a = -2 b = 4 a + b

3. a = -2 b = 4 a - b

4. a = -2 b = 4 a + -b

5. a = -2 b = 4 -a + b

6. a = -2 b = 4 ab

7. a = -2 b = 4 |ab|

8. a = -2 b = 4 -(-(-a))

9. a = -2 b = 4 -(-(-b))

10. a = -2 b = 4 -ab

11. a = -2 b = 4 -(ab)

12. a = -2 b = 4 -(a+b)

13. a = -2 b = 4 -(a-b)

14. a = -2 b = 4 -(a- -b)

15. a = -2 b = 4 abab

16. -a b

17. a = -2 b = 4 -(a/b)

18. x + y

19. x - y

20. xy

21. xyxy

22. |x + y|

23. |xy|

24. -|x + y|

25. -(x + y)

26. -x

27. -(-(-y))

28. -(x – y)

29. x2x2

30. x3x3

31. -(x 2 )

32. -4y

33. 3x