76 Chapter 1 The Set of Real Numbers Concept 4: Applications Involving Addition of Real Numbers 91. The temperature in Minneapolis, Minnesota, began at 5° F ( 5° below zero) at 6:00 A.M. By noon the temperature had risen , and by the end of the day, the temperature had dropped from its noontime high. Write an expression using addition that describes the change in temperatures during the day. Then evaluate the expression to give the temperature at the end of the day. 92. The temperature in Toronto, Ontario, Canada, began at 4° F. A cold front went through at noon, and the temperature dropped . By 4:00 P.M. the temperature had risen from its noontime low. Write an expression using addition that describes the changes in temperature during the day. Then evaluate the expression to give the temperature at the end of the day. 93. For 4 months, Amara monitored her weight loss or gain. Her records showed that she lost 8 lb, gained 1 lb, gained 2 lb, and lost 5 lb. Write an expression using addition that describes Amara’s total loss or gain and evaluate the expression. Interpret the result. (See Example 6.) 8 1 2 152 10; Amara lost 10 lb. 94. Alan just started an online business. His profit/loss records for the past 5 months show that he had a profit of $200, a profit of $750, a loss of $340, a loss of $290, and a profit of $900. Write an expression using addition that describes Alan’s total profit or loss and evaluate the expression. Interpret the result. 200 750 13402 12902 900 1220; Alan had a profit of $1220. 95. Yoshima has $52.23 in her checking account. She writes a check for groceries for $52.95. a. Write an addition problem that expresses Yoshima’s transaction. b. Is Yoshima’s account overdrawn? 96. Mohammad has $40.02 in his checking account. He writes a check for a pair of shoes for $40.96. a. Write an addition problem that expresses Mohammad’s transaction. b. Is Mohammad’s account overdrawn? Yes 40.02 140.962 Yes 4 192 2; 3°F 9° 2° 5 13 1112; 3°F 13° 11° 52.23 152.952 97. In the game show Jeopardy, a contestant responds to six questions with the following outcomes: $100, $200, $500, $300, $100, $200 a. Write an expression using addition to describe the contestant’s scoring activity. 100 200 15002 300 100 12002 b. Evaluate the expression from part (a) to determine the contestant’s final outcome. 98. A company that has been in business for 5 yr has the following profit and loss record. a. Write an expression using addition to describe the company’s profit/loss activity. b. Evaluate the expression from part (a) to determine the company’s net profit or loss. $0 Year Profit/Loss ($) 1 50,000 2 32,000 3 5,000 4 13,000 5 26,000 48,000; The company lost $48,000. 50,000 132,0002 150002 13,000 26,000 Writing Translating Expression Geometry Scientific Calculator Video
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