Page 160 - Basic College Mathematics with Early Integers

S E C T I O N 2.4 I SUBTRACTING INTEGERS 137

Objective Simplify. See Examples 9 and 10.

39. 7 - 3 - 2 40. 8 - 4 - 1 41. 12 - 5 - 7

42. 30 - 7 - 12 43. -5 - 8 - 1-122 44. -10 - 6 - 1-92

45. -10 + 1-52 - 12 46. -15 + 1-82 - 4 47. 12 - 1-342 + 1-62

48. 23 - 1-172 + 1-92 49. -1-62 - 12 + 1-162 50. -1-92 - 7 + 1-232

51. -9 - 1-122 + 1-72 - 4 52. -6 - 1-82 + 1-122 - 7 53. -3 + 4 - 1-232 - 10

54. 5 + 1-182 - 1-212 - 2

Objective Evaluate x - y for the given replacement values. See Examples 11 and 12.

55. x =-4 and y = 7 56. x =-7 and y = 1

57. x = 8 and y =-23 58. x = 9 and y =-2

Evaluate 2x - y for the given replacement values. See Examples 11 and 12.

59. x = 4 and y =-4 60. x = 8 and y =-10

61. x = 1 and y =-18 62. x = 14 and y =-12

Objective Solve. See Example 13.

The bar graph from Section 2.2 showing the average temperature in Fahrenheit of known planets is reprinted below.
Notice that a negative temperature is illustrated by a bar below the horizontal line representing 0°F, and a positive
temperature is illustrated by a bar above the horizontal line representing 0°F.

Average Surface Temperature of Planets*
63. Find the difference in temperature between
Earth and Neptune. 1200
1000
867
800
Degrees Fahrenheit 200 0 59
64. Find the difference in temperature between 600
Venus and Mars. 400 330

65. Find the difference in temperature between 200 81 162 218
the two plants with the lowest temperature. 400 323 330
600
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
66. Find the difference in temperature between
Jupiter and Saturn.
*(For some planets, the temperature given is the temperature where the atmosphere pressure equals 1 Earth
atmosphere; Source: The World Almanac)