Page 239 - Basic College Mathematics with Early Integers

216 C HAPTE R 3 I FRACTIONS

Subtract and simplify. See Examples 4, 5, and 7.

10 4 9 5 4 1 7 4
17. - 18. - 19. - 20. -
11 11 13 13 5 5 8 8

7 3 18 3 7 1 5 1
21. - 22. - 23. - 24. -
4 4 5 5 8 8 6 6

25 15 30 15 11 3 14 4
25. - - 26. - - 27. - 28. -
12 12 20 20 10 10 15 15
27 8 37 18
29. - - a- b 30. - - a- b
33 33 45 45

Mixed Practice Perform the indicated operation. See Examples 1 through 8.

8 5 7 9 99 9 85 15 13 13
31. + 32. + 33. - 34. - 35. - -
21 21 37 37 100 100 200 200 28 28

15 15 3 7 2 5 1 6
36. - - 37. - + a- b + a- b 38. - + a- b + a- b
26 26 16 16 16 18 18 18

Objective Evaluate each expression for the given replacement values. See Example 9.

3 2 7 9
39. x + y; x = , y = 40. x - y; x = , y =
4 4 8 8

1 3 1 5
41. x - y; x =- , y =- 42. x + y; x =- , y =
5 5 6 6

Objective Find the perimeter of each figure. (Hint: Recall that perimeter means distance around.) See Example 10.
43. 7 44. 3
4 inch 20 inch 13 foot
20
Triangle 2 6
13 foot 13 foot
Pentagon
9
20 inch 3 foot
13
4
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13 foot
45. 46.
5 meter Rectangle
12 Square Z centimeter
7
12 meter