Lowest Places on Earth Dead Sea (Jordan/Israel) 1,360 feet (414 m) Lake Assal (Djibouti, Africa) 509 feet (155 m) Turpan Pendi (China) 505 feet (154 m) Qattara Depression (Egypt) 435 feet (133 m) Denakil (Ethiopia) 410 ft (125 m) Laguna del Carbón (Argentina) 344 ft (105 m) Death Valley (United States) 282 ft (86 m) Salton Sea (California) 227 ft (69 m) Salinas Chicas (Argentina) 131 ft (40 m) Caspian Sea (Central Asia) 92 ft (28 m) (www.nps.gov) Use this information for Exercises 59–62 to fi nd the difference in elevation between the given geographical locations. 59) Mount McKinley and the Salton Sea; give your answer in feet. 60) Mount Everest and the Dead Sea; give your answer in feet. 61) The Caspian Sea and Lake Assal; give your answer in meters. 62) Salinas Chicas and Laguna del Carbón; give your answer in meters. Objective 3: Combine Adding and Subtracting of Signed Numbers Perform the operations. 63) 3 (14) (5) 64) 7 (8) (9) 65) 3 (26) (7) 14 66) 6 (19) (2) 9 67) 34 (18) (26) 11 15 68) 59 (42) (10) 23 7 69) 156 438 (257) 70) 106 357 (118) 71) 9.4 6.7 3.5 72) 7.3 4.1 9.2 73) 41.8 (80.6) (159.7) 31.2 74) 62.2 97.4 (15.3) (129.1) 75) 5 6 1 2 a 4 3 b 76) 1 18 2 9 a 5 3 b 77) 4 5 a 1 3 b 7 15 78) 1 4 a 5 8 b 3 2 22) Explain, in your own words, how to tell a subtraction problem from a negative sign. Rewrite each subtraction problem as an addition. Then, simplify. 23) 15 6 24) 13 5 25) 5 14 26) 8 19 27) 125 183 28) 234 851 29) 8 3 30) 7 5 31) 134 925 32) 117 893 33) 10 (18) 34) 23 (27) 35) 13 (2) 36) 15 (7) 37) 29 (15) 38) 43 (12) 39) 421 (91) 40) 239 (58) 41) 791 683 42) 584 937 43) 3508 (2917) 44) 8106 (5876) 45) 54 54 46) 37 37 47) 21 (21) 48) 49 (49) 49) 20.9 42.3 50) 31.2 45.7 51) 1.7 (8.6) 52) 2.9 (4.3) 53) 3 2 9 4 54) 1 5 14 15 55) 1 6 2 9 56) 3 4 1 6 57) 1 6 a 1 3 b 58) 7 10 a 4 5 b The summit of Mount Everest is 29,035 ft (8850 m) above sea level and is the highest point on Earth. Mount McKinley is the highest mountain on the North American continent, and its summit is at 20,320 ft (6194 m) above sea level. The table at the top of the next column notes several of the lowest places on Earth. www.mhhe.com/messersmith SECTION 10.3 Subtracting Signed Numbers 739
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