Answer Key 1575 ANSWER KEY Chapter 1 Problems & Exercises 1 a. b. 3 . 5 length: ; width: ; . 7 9 (a) (b) 11 2 kg 13 a. b. 15 (a) (c) 17 a. 3 b. 3 c. 3 19 a) (b) 21 23 25 27 29 Sample answer: heartbeats (b)