Section 2.3 Subtraction of Integers 105 For Exercises 77–80, find the range. The range of a set of numbers is the difference between the highest value and the lowest value. That is, range highest lowest. 77. Low temperatures for 1 week in Anchorage : 4, 8, 0, 3, 8, 1, 2 1°C2 78. Low temperatures for 1 week in Fargo : 6, 2, 10, 4, 12, 1, 3 1°C2 79. Find two integers whose difference is 6. Answers may vary. 80. Find two integers whose difference is 20. Answers may vary. For Exercises 81 and 82, write the next three numbers in the sequence. 81. 5, 1, 3, 7, ____, ____, ____ 82. 13, 18, 23, 28, ____, ____, ____ Expanding Your Skills For Exercises 83–90, assume a 0 (this means that a is positive) and b 0 (this means that b is negative). Find the sign of each expression. 83. a b 84. b a 85. 86. 0a 0 0b 0 0a b 0 87. 0a 0 88. 0b 0 89. 1a2 90. 1b2 Calculator Connections Topic: Subtracting Integers on a Calculator The key is used for subtraction.This should not be confused with the key or key, which is used to enter a negative number. Expression Keystrokes Result 7 4 7 4 or 7 4 11 Calculator Exercises For Exercises 91–96, subtract the integers using a calculator. 91. 190 223 92. 288 145 93. 23,624 190012 94. 14,593 134,4992 95. 892,904 123,5462 96. 104,839 124,9382 97. The height of Mount Everest is 29,029 ft. The lowest point on the surface of the Earth is 35,798 ft (that is, 35,798 ft below sea level) occurring at the Mariana Trench on the Pacific Ocean floor.What is the difference in altitude between the height of Mt. Everest and the Mariana Trench? 98. Mt. Rainier is 4392 m at its highest point. Death Valley, California, is 86 m below sea level (86 m) at the basin, Badwater.What is the difference between the altitude of Mt. Rainier and the altitude at Badwater?
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