Show all work and your final answer. Answers only will not earn credit. If you just write the problem and final answer, that is not showing work. Clearly present all the steps and/or calculations done that lead to the final answer. Please make sure that your writing is DARK. Circle your final answer.Homework Template Form by: Y. Brobst, M.A., 2013 Source: Beginning Algebra, 8th edition by Aufmann & Lockwood

(Show work as in the examples on pages 293-295 of book. Answers only will not earn credit.)

Math 12B Week 1 Homework – Chapter 6 12 Student Name: _________________________________________ Show all work and your final answer. Answers only will not earn credit. If you just write the problem and final answer, that is not showing work. Clearly present all the steps and/or calculations done that lead to the final answer. Please make sure that your writing is DARK. Circle your final answer.Homework Template Form by: Y. Brobst, M.A., 2013 Source: Beginning Algebra, 8th edition by Aufmann & Lockwood6w + 6w = (3 + 4)60 12w = 7 * 60 12w = 420 w = 35 2(35 – c) = 60 2c = 70 – 60 2c = 10 c = 5 Whale speed in calme water = 35 mph Ocean current rate = 5 mph 6.4 #13. x = rowing y = current 2(x + y) = 40 2(x – y) = 16 2x + 2x = 40 + 16 4x = 56 x = 14 2(14 + y) = 40 2y = 40 – 28 2y = 12 y = 16 Calm water rowing rate = 14 km in 1 h Current rate = 6 km in 1 h 6.4 #15. x = boat

Math 12B Week 1 Homework – Chapter 6 13 Student Name: _________________________________________ Show all work and your final answer. Answers only will not earn credit. If you just write the problem and final answer, that is not showing work. Clearly present all the steps and/or calculations done that lead to the final answer. Please make sure that your writing is DARK. Circle your final answer.Homework Template Form by: Y. Brobst, M.A., 2013 Source: Beginning Algebra, 8th edition by Aufmann & Lockwoody = current 3.5(x + y) = 35 3(x – y) = 12 3.5(x + y) = 35 x + y = 10 3(x – y) = 12 x – y = 4 x + x = 10 + 4 2x = 14 x = 7 7 + y = 10 y = 3 Calm water rate = 7 mph Current rate = 3 mph 6.4 #25. x = cinnamon y = spice 4x + y = 12 x + 4y =15 16x – x = 48 – 15 15x = 33 x = 11/5 = 2.2 4 * 11/5 + y =12 y = 12 – 44/5 y = 16/5 = 3.2 Cost of cinnamon tea is less than spice tea

Math 12B Week 1 Homework – Chapter 6 14 Student Name: _________________________________________ Show all work and your final answer. Answers only will not earn credit. If you just write the problem and final answer, that is not showing work. Clearly present all the steps and/or calculations done that lead to the final answer. Please make sure that your writing is DARK. Circle your final answer.Homework Template Form by: Y. Brobst, M.A., 2013 Source: Beginning Algebra, 8th edition by Aufmann & Lockwood6.4 #29. (Show work as in the examples on pages 295-297 of book. Answers only will not earn credit.) x = wheat y = rye 12x + 15y = 39.87 15x + 10y = 33.3 2(12x + 15y = 39.87) 24x + 30y = 79.74 -3 (15x + 10y = 33.3) -45x – 30y = -99.9 24x + 30y = 79.74 -45x – 30y = -99.9 24x – 45x = -21x 79.74 – 99.9 = 20.16 -21x/21 = -20.16/-21 = 0.96 x = 0.96 12(0.96) + 15y = 39.87 15y + 11.52 = 39.87 15y + 11.52 + -11.52 = 39.87 + -11.52 15y = 28.35 15y/15 = 28.35/15 y = 1.89 Wheat flour cost is $0.96 per 1lb Rye flour cost is $1.89 per 1lb