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Purdue MA 15300 - Study guide

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iLrn Hints for Lesson 27, 28, and 29 You can always view correct answers on iLrn after you end an assignment by clicking on “view details” to any problem. This will help you judge if your math is incorrect. If you get back into the assignment, you should have a different version of that problem. You can always submit inputting questions to the discussion board linked from: www.math.purdue.edu/MA 153 Be specific with your question. Kristin is live on the board Tue/Thurs/Sun nights from 8-10pm and will answer also at other times ASAP. Students complain that iLrn will not accept their answer, but it is almost always the math that is wrong so iLrn is working correctly. Remember that we drop 4 online assignments at the end of the semester. Lesson 27: #1: Be sure to simplify your answers before inputting them. #2: Do not include x= with your answers. Math hint: There will be two solutions. #4 Math hint: You must simplify your answer. For example, if your answer is 3729)( ttr =, you must simplify to ()()39 ttr =. Enter 3from the x pulldown (on the top row right next to the trash can). There will be a box on the outside of the radical to enter the index and a box under the radical to enter the rest. Do not enter r(t)=. #5 Math hint: You must simplify the answer similar to what is above. There will be a number that can be taken out from under the radical. Do not include h(t)= with your answer. Lesson 28: USE A SIGN CHART FOR THESE PROBLEMS. #3 Math hint: Because this is an inequality, you cannot take the square root of both sides and use +/-. One way to handle this problem is to subtract the number to the left side and factor the difference of squares. Then use a sign chart to finish. #4 Math hint: Even if you have a common factor to cancel, be sure to include the value that makes it zero in the sign chart. For example, if you have ()( )()( )03121≤++−+xxxx, then -3, -1, and 2 must be included on the top of the sign chart. Then you are welcome to cancel the common x+1 and list only x-2 and x+3 as your factors along the side of the chart to find the resulting sign. Also, for interval notation, we can never divide by zero, so we must always use parantheses with -3 and -1, if necessary. The answer to this example would be . (]2,1)1,3( −∪−−OVER#5 Math hint: Do not use negative velocities within your sign chart (velocity should only be positive). Your sign chart will strat with zero (not including). Lesson 29: #1 and #2 Math hints: (a) and (b) use a sign chart. (c) Do not include x= with the answer. (e) Remember to input as an ordered pair. (f) Even function is symmetric with respect to the y-axis Odd function is symmetric with respect to the origin Neither does not have symmetry. #4 Reduce fraction to lowest terms, if


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Purdue MA 15300 - Study guide

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