Course Announcement MATH 100 Developmental Mathematics Please make the following amendment to the: Study Guide - Up-date as of June 2007: page 45, line just above the Note 9a2 + 6ab ÷ 3a = 3a + 2b should read (9a2 + 6ab) ÷ 3a = 3a + 2b Developmental Math, by Probert and Targa: page 40, Chapter 2, Exercise Set 2.15 question # 32 '… how much of each ingredient is required to make 3 kg of gunpowder? ' should read ' … how much more of each ingredient is required to make 3 kg of gunpowder? ' page 236, Chapter 9, Exercise Set 9.9.1 question # 6 ' x – 3y = –9 ' should read ' x – 3y = 9 ' page 239, Chapter 9, Exercise Set 9.9.2 #545638 July 3, 2007 question # 8 ' 10 – 1 x = – y ' 3 should read ' 10 – 1 x = y ' 3 page 292, Chapter 10, End of Chapter Test question # 7 ' 5 > − 4x + 2 ≥ 12 ' should read ' 5 < − 4x + 2 ≤ 12 ' page 375, EXAMPLE 13-10 first line below ‘Answer:’ should read x2 - y2 x xy x2 - 2xy + y2 2x2y2 Multiply by reciprocal page 400, first line above Exercise Set 13.4 should read 1. 4y + 7x y – 3x Developmental Math, by Probert and Targa Answers to the Exercises page 485, Chapter 1, Exercise Set 1.4 # 3. Answer should be: −1 page 486, Chapter 2, Exercise Set 2.3 # 10. Answer should be: 2 9/11 page 490, Chapter 3, Exercise Set 3.5 # 4. Answer should be: 5000.0 #545638 July 3, 2007 page 491, Chapter 3, Exercise Set 3.6 # 1. Answer should be: 73.8308 page 492, Chapter 4, Exercise Set 4.4 # 1. Answer should be: 14000 W page 495, Chapter 7, Exercise Set 7.2.2 # 2. Answer should be: – 3 y # 4. Answer should be: – 12 K – 7 T # 6. Answer should be: – 3 x + 7 y page 495, Chapter 7, Exercise Set 7.3 # 9. Answer should be: 7 g / cm 3 page 495, Chapter 7, Exercise Set 7.4 # 5. Answer should be: a = 2 page 496, Chapter 7, End of Chapter Test # 2d. Answer should be: m · (m + 1) # 4c. Answer should be: 15 x 10 / 3 page 497, Chapter 8, Exercise Set 8.4 # 2. Answer should be: ∠BAC = ∠DEC, ∠ABC = ∠CDE, ∠ACB = ∠DCE page 497, Chapter 8, Exercise Set 8.6.2 Answers are misnumbered: # 3 should read # 2; # 4 should read # 3; 4. # 5 should read # page 497, Chapter 8, Exercise Set 8.7 # 1c. Answer should be: A = 48 m 2 # 1g. Answer should be A = l 2 , P = 4 l # 3. Answer should be: 36.87% #545638 July 3, 2007 page 498, Chapter 8, Exercise Set 8.8 # 3b. Answer should be: 384.75 m 2 page 500, Chapter 9, Exercise Set 9.1 # 3. Answer should be: (0, – 2) between Quadrants III and IV page 506, Chapter 9, Exercise Set 9.5 # 28. Left-most labeled point should be: (-8, 2.5) page 509, Chapter 9, Exercise Set 9.7 # 9. Answer should be: y = 3 x + 1 2 page 512, Chapter 9, End of Chapter Test # 11. Answer should be: m = 4 and b = 6 page 513, Chapter 10, Exercise Set 10.1.1 # 30. Answer should be: x ≤ 25 page 514, Chapter 10, Exercise Set 10.1.1 # 57. Answer should be: $1333.33 page 518, Chapter 10, End of Chapter Test ⎧ # 7. Answer should be: ⎨x − ⎩ 5 3⎫ ≤x<− ⎬ 2 4⎭ page 519, Chapter 11, Exercise Set 11.2 # 1d. Answer should be: composite # 2b. Answer should be: 3 × 5 × 13 page 519, Chapter 11, Exercise Set 11.4 # 6. Answer should be: 2g( 1 – 2h ) page 519, Chapter 11, Exercise Set 11.5 # 4. Answer should be: – 6t 2 + 22t – 20 #545638 July 3, 2007 page 520, Chapter 11, End of Chapter Test # 1a. Answer should be: Composite: 1, 2, 3, 4, 6, 8, 12, 24 page 521, Chapter 12, Exercise Set 12.2.2 # 16. Answer should be: x = 3 ± √ 14 page 522, Chapter 12, Exercise Set 12.2.3 # 24. Answer should be: x = 4 ± i √ 19 5 # 28. Answer should be: y = 1± √ 22 3 Developmental Math, by Probert and Targa Students Solutions Manual page 82, Exercise Set 12.2.3 # 24. last two lines of solution should read: x = 8 ± √ (-1)· 4 · 19 10 x = 4 ± i √ 19 5 # 28. last three lines of solution should read: 3y2 - 2y - 7 = 0 y = -(-2) ± √ (-2)2 – 4 · 3· (-7) 2·3 y = 1 ± √ 22 3 #545638 July 3, 2007
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