Page 185 - Basic College Mathematics with Early Integers

162 C HAPTE R 2 I INTEGERS AND INTRODUCTION TO VARIABLES

(2.3) Add.

33. 5 + (-3) 34. 18 + (-4) 35. -12 + 16 36. -23 + 40

37. -8 + (-15) 38. -5 + (-17) 39. -24 + 3 40. -89 + 19

41. 15 + (-15) 42. -24 + 24 43. -43 + (-108) 44. -100 + (-506)

45. The temperature at 5 a.m. on a day in January was 46. A diver starts out at 127 feet below the surface and
-15° Celsius. By 6 a.m. the temperature had fallen 5 then swims downward another 23 feet. Use a signed
degrees. Use a signed number to represent the tem- number to represent the diver’s current depth.
perature at 6 a.m.

47. During the 2004 PGA Masters Tournament, the win- 48. During the 2004 U.S. Open Golf Tournament, the
ner, Phil Mickelson, had scores of 0, -3, -3, and -3 winner, Retief Goosen, had a score of -4. The third-
over four rounds of golf.What was his total score for place finisher, Jeff Maggert, had a score that was
the tournament? (Source: Professional Golfer’s 5 points more than the winning score.What was Jeff
Association) Maggert’s score in the U.S. Open? (Source:
Professional Golfer’s Association)

For Exercises 49 and 50, use the map at the beginning of this Chapter Review.

49. The high temperature for London, England, is 155 de- 50. The high temperature for Los Angeles, California, is
grees greater than the low temperature for Barrow, 125 degrees greater than the low temperature for
Alaska. Find the high temperature for London. Providence, Rhode Island. Find the high temperature
for Los Angeles.

(2.4) Subtract.

51. 12 - 4 52. -12 - 4 53. 8 - 19 54. -8 - 19

55. 7 - (-13) 56. -6 - (-14) 57. 16 - 16 58. -16 - 16

59. -12 - (-12) 60. ƒ -5 ƒ - ƒ -12 ƒ 61. -(-5) - 12 + (-3) 62. -8 + ƒ -12 ƒ - 10 - ƒ -3 ƒ

Solve.

63. Josh Weidner has $142 in his checking account. He 64. If the elevation of Lake Superior is 600 feet above
writes a check for $125, makes a deposit for $43, sea level and the elevation of the Caspian Sea is
and then writes another check for $85. Represent the 92 feet below sea level, find the difference of the
final dollar amount in his account by an integer. elevations.
Copyright 2012 Pearson Education, Inc.

For Exercises 65 and 66, use the map at the beginning of this Chapter Review.

65. The low temperature for Reykjavik is 35 degrees less 66. The low temperature for Berlin, Germany, is
than the low temperature for Sydney, Australia. Find 14 degrees less than the low temperature for
the low temperature for Reykjavik. Shanghai, China. Find the low temperature for
Berlin.