Write two equivalent forms of each fraction by moving its negative sign. 81) 3 11 82) 2 9 83) 22 23 84) 15 19 Fill in the blank. 85) 77 ____ 11 86) 42 ____ 3 87) ____ (4) 108 88) ____ (7) 35 89) If an expression contains only multiplication and division, how do you simplify it? Simplify each expression. 90) 5 (2) (4) 91) 012 0 (6) 08 0 92) a 1 3 b a 3 5 b a 7 2 b Solve the application problem. Express your answer as a positive or negative number accordingly. 93) A small plane descended 225 ft each minute for a 15-minute landing. What was the change in the plane’s altitude during that time? 94) Krishna is downloading a large video fi le to his computer at a rate of 5 megabits per sec. If the fi le size is 6900 megabits, how many minutes will it take for Krishna to download the entire fi le? (10.5) Write each multiplication problem using an exponent. 95) 13 (13) (13) (13) 96) 4 7 a 4 7 b a 4 7 b Evaluate. 97) (7)2 98) (10)2 99) 72 100) 102 101) (2)3 102) (4)3 103) 23 104) 43 105) a 3 4 2 106) a b 1 2 3 b Simplify each expression using the order of operations. 107) 3(8) 7(5) 4(6) 108) 34 9 (3)2 109) 15 3116 (18 6) 110) 16 2181 (11 8) 111) a 1 6 2 15 2 a b 7 50 b 112) a 5 4 1 6 2 a b 13 84 b 113) 23(4 3) 4(6) 6 7(3 5) (7 14) 114) 33(8 7) 9(2) 6 3(4 5) (3 19) Each problem is done incorrectly. Find the error and correct it. 115) 281 (7 4)2 Work: 181 (7 4)2 9 49 16 58 16 74 116) 32 24 (4) Work: 32 24 (4) 8 (4) 2 Mixed Exercises Perform the indicated operations. 117) 4 15 a 3 24 b 118) 308 527 119) 24 a 1 3 3 4 2 b 11 6 120) 6.12 (6) 121) 0125 0 (308) (649) 122) 14 6 2 38 52 7(1 4) (2)4 123) 33 3(8) 2 (15) 124) 02 0 (16)(3) (7 9)3 10 Solve each problem. 125) Marika is on a mountain at an altitude of 9450 ft. At the same time, her friend is scuba diving at a depth of 68 ft. What is the difference between these two elevations? 126) An appliance store has seen its profi ts fall by $2100 per month for the last year. Use a signed number to determine the store’s change in profi t over the last year. Fill in the blank with or to compare the numbers. 1) 5 ____ 2 2) 4 ____ 7 3) 5 8 ____ 1 2 4) 5.7 ______ 5.6 5) Graph the numbers on the number line. 4.5, 2, 3 4 , 1 2 3 , 3.5 2524232221 0 1 2 3 4 5 Chapter 10: Test 762 CHAPTER 10 Signed Numbers www.mhhe.com/messersmith
messersmith_power_basic_college_1e_ch4_7_10
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