96 Chapter 1 The Set of Real Numbers 139. A pediatrician analyzed the effect of a special baby food on five toddlers. He recorded the amount of weight lost or gained (in ounces) by each child for one month as shown in the table. 12 1152 4 192 3 5 Baby A B C D E Gain/Loss (oz) 12 15 4 9 3 Write an expression to calculate the average gain or loss in weight of the children and then simplify. Interpret your answer. 140. At the end of a 2-month class, a personal trainer analyzed the effect of her new exercise routine by recording the gain or loss (in inches) in waist measurements of her clients. The results are shown in the table. Client A B C D E F Gain/Loss (in.) 1.5 2 1.5 2.5 3 0.5 Write an expression to calculate the average gain or loss in waist measurement and then simplify. Interpret your answer. 142. Evaluate the expressions in parts (a) and (b). a. 10 9 8 7 –34 b. 10192182172 5040 c. Explain the difference between the operations in parts (a) and (b). In part (a), we subtract; in part (b), we multiply. 141. Evaluate the expressions in parts (a) and (b). a. 4 3 2 1 10 b. 4132122112 24 c. Explain the difference between the operations in parts (a) and (b). In part (a), we subtract; in part (b), we multiply. The average loss was 1 oz. 1; The average loss was 0.5 in. 1.5 122 1.5 2.5 132 10.52 6 0.5; Problem Recognition Exercises Adding, Subtracting, Multiplying, and Dividing Real Numbers Perform the indicated operations. 1. a. 4 b. 32 c. 12 d. 2 8 142 8142 8 142 8 142 12 122 12 122 12122 12 122 2. a. 10 b. 14 c. 24 d. 6 36 9 36192 36 9 36 9 3. a. 27 b. 324 c. 4 d. 45 27 132 27 132 27132 27 132 4. a. 30 b. 24 c. 81 d. 9 5 1102 1 51102 5 1102 5 1102 5. a. 50 b. 15 c. d. 5 2 20 4 20 4 20 4 20142 6. a. 5 b. 24 c. 16 d. 80 4 1162 1 41162 4 1162 4 1162 7. a. 64 b. 12 c. d. 20 4 21 3 21 3 21132 21 3 8. a. 7 b. 24 c. 63 d. 18 80152 80 152 80 152 80 152 9. a. 400 b. 85 c. 16 d. 75 14 1212 2 14 1212 141212 14 1212 10. a. 7 b. 294 c. d. 35 3 06 0 02 0 06 2 0 06 0 02 0 06 2 0 11. a. 8 b. 4 c. 4 d. 8 12. a. 09 0 07 0 16 b. 09 0 07 0 2 c. 09 7 0 2 d. 09 7 0 16 Writing Translating Expression Geometry Scientific Calculator Video
miller_introductory_algebra_3e_ch1_3
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