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Purdue MA 15300 - Lecture Notes

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Thomson Now Hints for Lessons 11, 12 and 13 In general: You can visit www.math.purdue.edu/MA 153 and use the discussion board to post questions and/or read responses. Kristin will be live on that board MWF from 4-6 pm all semester. If you post a question at a different time, she will respond as soon as she is able. Do not post after 6 pm on a due date and expect an immediate answer. She will not help you as a tutor, but may provide some hints. Please do not expect her to solve things for you. In general, use Mozilla browser with a PC. Internet Explorer can cause technical issues with Thomson Now problems. We recommend using an ITAP computer or following the configuration instructions on the Thomson Now homepage. If you log in and see a message that says popups are blocked, enter Thomson Now anyway. That error does not affect your assignments. However, a current version of Java must be installed for Thomson Now to work properly. If the system check detects a Java problem, follow the instructions given to correct that. You can always view the correct answer to each problem after submitting the assignment. Click on “view assignment results”. It will show you what you entered and what the correct answer was. If you log back into the assignment, you will get a different version of the problems that were not correct. Correct problems stay correct and you do not redo them. Lesson 11: For equations using the quadratic formula, you must simply your answer as much as possible before entering. For example, 12 204± must be simplified to 532± or 1352±. #4: To enter a subscript, , for example, type q then choose x from under the log x menu. Math hint: Remember that all values represent positive quantities so we disregard the negative square root and only use the positive. Do NOT rationalize the denominator and you can leave the fraction under one square root. 1q #5: It is easier to leave the ½ instead of multiplying both sides by 2. Subtract the s to the right side and use the quadratic formula. This is a fairly difficult problem. To enter a subscript and an exponent, use x option under the log x menu. Again, all values represent positive quantities so disregard the negative square root. #7: Math hint: When solving the equation, one of the answers does not make practical sense to the application problem. Choose the solution that does make sense and find the dimensions of the sheet of paper. For example, since the length was twice the width, if my answer that made sense was 9, the dimensions are 9 by 18.Lesson 12: #1: Math hint: You will use the quadratic formula to solve for t. Round answers to three decimal places. #2 (b) Math hint: This equation will factor by trial and error to find v. Remember to disregard the answer that does not make practical sense to the problem. #4 and 5: This problem could factor by trial and error, but it is probably easier to use the quadratic formula. Remember to disregard the answer that does not make practical sense to the problem. #7: Math hint: Remember that the rate given is mph (miles per hour) and therefore, your answer will be in terms of hours. To round to the nearest minute, you must multiply your answer by 60, then round to the nearest minute. #8: If no pizza box picture shows, refer to #71 in the textbook on page 86 for the picture of the pizza box. All the numbers you will need are shown online. Lesson 13: #1,2 and 3: Enter the answer in the form a+bi (no factoring of common factors). Use lower case i as the imaginary unit. #6 and 7: Math hint: Remember to use the conjugate of the denominator. Then be sure to write your answer in the form a+bi. For example, to write 312i+ in the form a+bi, I multiply the numerator and denominator by 12i−. The result is 365i−. To enter online, it must be written as a+bi, or 3/5-6/5i. The same would be true on an exam. #8: Math hint: Before you FOIL, be sure to change the radicals to their imaginary counterparts. For example, 16− is 4i. #9: Math hint: If two imaginary numbers are equal to each other, then their real parts have to be equal as do the imaginary parts. For example, if ()216104xyi−− =+yi, then 2 10 and 16 4xyi−= − =yi. Then you can solve for x and for y (solve for y


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Purdue MA 15300 - Lecture Notes

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