AnSWErS to tHE StudEnt'S Book ExErCiSES - Hodder Plus Home

Chapter 12Exercise 12.1 (page 158)1 x 5 7 2 x 5 0.5 3 x 5 74 x 5 7 5 x 5 1 6 x 5 77 x 5 5 8 x 5 4 9 x 5 1010 x 5 6 11 x 5 65 12 x 5 6713 y 5 68 14 m 5 69 15 m 5 6516 x 5 610 17 x 5 68 18 x 5 6419 x 5 62 20 x 5 610Exercise 12.2 (page 159)1 p 5 16 2 x 5 3 3 x 5 74 x 5 1 5 x 5 15 6 x 5 17 x 5 14 8 x 5 5 9 x 5 2410 x 5 10 11 x 5 10 12 a 5 113 x 5 51_ 14 x 5 3 15 x 5 2616 x 5 3 17 x 5 8 18 x 5 419 x 5 2 20 x 5 5.5Exercise 12.3 (page 160)1 x 5 3 2 x 5 3 3 x 5 24 x 5 10 5 x 5 3 6 x 5 27 x 5 10 8 x 5 22 9 x 5 310 x 5 2 11 x 5 2 12 x 5 113 x 5 3 14 x 5 4.5 15 x 5 416 x 5 6 17 x 5 1 18 x 5 219 x 5 23 20 x 5 7Exercise 12.4 (page 161)1 x 5 16 2 a 5 40 3 x 5 204 y 5 50 5 y 5 30 6 p 5 357 m 5 24 8 x 5 64 9 x 5 2710 y 5 33Exercise 12.5 (page 164)1 x . 132 x , 43 x , 134 x < 45 x > 36 x > 86 8 10 12 14 160 1 2 3 4 56 8 10 12 14 160 1 2 3 4 50 1 2 3 4 50 2 4 6 8 107 x , 2 8 x > 25 9 x , 2910 x . 1 11 x . 5 12 x < 913 x < 2 14 x . 6 15 x . 516 x , 0.25 17 x . 2 18 x > 319 x < 4 20 x , 4Mixed exercise 12 (page 165)1 m 5 9 2 p 5 2 3 x 5 84 x 5 3 5 p 5 8 6 x 5 4 or 247 x 5 6 or 26 8 p 5 4 or 24 9 x 5 4 or 2410 a 5 5 or 25 11 x 5 25 12 x 5 3013 y 5 18 14 y 5 49 15 a 5 3616 x < 217 x > 318 x , 319 x . 420 x . 20 1 2 3 4 50 1 2 3 4 50 1 2 3 4 50 1 2 3 4 50 1 2 3 4 5Chapter 13Exercise 13.1 (page 169)1 x 5 20 2 x 5 4 3 x 5 22_34 x 5 4 5 x 5 3 6 x 5 27 x 5 3_4 8 x 5 4 9 x 5 2410 x 5 2_511 x 5 4 12 x 5 413 x 5 3 14 x 5 21 15 x 5 1Exercise 13.2 (page 171)1 x 5 4 2 x 5 1_33 x 5 12.5 4 x 5 325 x 5 1_2 6 x 5 2.747 x 5 4.81 8 x 5 9.189 x 5 3.2 10 x 5 0.283Exercise 13.3 (page 173)1 x . 3 2 x < 53 x . 4 4 x . 65 x .1.6 6 x < 87 x . 216 8 x < 129 x < 3 10 x < 3.85Exercise 13.4 (page 176)1y65432101Rx 2y 62 3 4 5 6 x202Answers to the Student’s Book exercisesHigher WJEC GCSE Mathematics © 2010, Hodder Education