Sec 1.3-FocusAns - c) 7 ( - 9) = + 7 and the opposite of -...

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Section 1.3 Focus Exercise Answers 1. a) 10 – 3 = 10 + (- 3) = 7 b) 15 – 5 = 15 + (- 5) = 10 c) 8 – 12 = 8 + (- 12) = - 4 d) 9 – 9 = 9 + (- 9) = 0 e) - 2 – 4 = - 2 + (- 4) = - 6 f) - 6 – 9 = - 6 + ( - 9) = - 15 g) 3 – 8 = 3 + (- 8) = - 5 h) - 16 – 1 = - 16 + ( - 1) = - 17 2. a) 7 – 4 = - 4 + 7 = 3 b) 2 – 12 = - 12 + 2 = - 10 c) - 3 + 6 = 6 – 3 = 3 d) - 9 – 1 = - 1 – 9 = - 10 e) - 10 – 8 = - 8 – 10 = - 18 f) 8 – 20 = - 20 + 8 = - 12 g) - 15 + 51 = 51 – 15 = 36 h) 22 – 29 = - 29 + 22 = - 7 3. a) 8 – ( - 10) = + 8 and the opposite of - 10 = 8 + 10 = 18 b) - 3 – ( - 4) = - 3 and the opposite of - 4 = - 3 + 4 = 1
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Unformatted text preview: c) 7 ( - 9) = + 7 and the opposite of - 9 = 7 + 9 = 16 d) - 9 ( - 4) = - 9 and the opposite of - 4 = - 9 + 4 = - 5 e) - 12 ( - 7) = - 12 and the opposite of - 7 = - 12 + 7 = - 5 f) - 6 ( - 6) = - 6 and the opposite of - 6 = - 6 + 6 = 0 4. a) 2 (- 7) = 2 + 7 = 9 b) 12 (- 2) = 12 + 2 = 14 c) - 3 (- 5) = - 3 + 5 = 2 d) - 6 (- 7) = - 6 + 7 = 1 e) - 4 (- 4) = - 4 + 4 = 0 f) 0 (- 10) = 0 + 10 = 10 5. a) 0.8 b) - 5.5 c) - 0.7 d) - 1.1 e) - 9.3 f) - 7.4 g) - 1.25 h) - 2.52 i) 5 9 j) - 10 11 k) 11 25 l) - 6 7 m) 9 13 n) - 5 14 o) 13 11 p) 17 21 6. Numerical expression: 23 35 = - 12; Marlas new balance is - $12. 7. Numerical expression: - 64 36 = - 100; Toms new balance is - $100. 8. Numerical expression: - 6 + 13 = 7; The temperature at noon was 7. 9. Numerical expression: - 2 15 = - 17; The temperature at 10:00 PM was - 17....
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