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Questions on math material
If you have questions about a problem, textbook, solution manual, etc contact us via email. Make sure you provide us the following.
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Updates
Algebra
- Downloads
- Resources:
- The syllabus included in your printed Teachers Guide and/or CD may NOT contain problems for all of chapter 1. For an update download the new Teachers Guide on the link above.
- Mislabeled DVD's: Some of the DVD's may be mislabeled. The video content is correct - just the labels are wrong on some versions. The correct labels for the first two disks should say
Geometry
- Downloads: Teachers Guide (includes tests or download test separately)
- Issue with using Jacobs 2nd with our DVD's.
- Chapter 2, Lesson 6, Number 9 generates lots of questions as to why the demonstration does not prove the case. The issue is that in number 9 he has proved a SINGLE CASE, not all cases. If I tried to prove to you that the sun is "Always" to the west and walked outside in the afternoon - would you believe my evidence? You would tell me to try in the morning and you would show me I was wrong. Here Raoul demonstrated that the statement is true in a PARTICULAR case - but he did not PROVE it is so in ALL cases.
It so happens it is true in all cases - but hopefully you can see from this that a simple example is NEVER proof.
- Chapter 2, Lesson 6, Number 10 Similar to number 9 above, even 1000 examples showing me something does not PROVE anything. In fact all I need to DISPROVE 1000 examples is ONE example showing it does not work.
This is an important issue in science and in logic in general. Think about it. Even when you hear something on the news! How often do we find a particular example being used to argue truth? If someone steals from you have you proved ALL people are evil? No - you showed one example. Much of what people argue in society is from examples - which can be evidence of some larger truth - but not always. So like the word "TRUTH" the word "PROOF" is very powerful and has a very specific meaning. They do NOT mean sometimes or most of the time - they mean at ALL times. Now read John 17:17 and consider the word TRUTH and PROOF.
- Chapter 12, Lesson 5, Number 43 has the wrong solution in Teachers Guide Published by Freeman. The correct answer is "To other points on the major arc AB." Thanks to Charlie in Wisconsin for catching this error. Harold Jacobs indicates that this problem is corrected in some of the most recent printings of the Enhanced Teachers Guide.
- Chapter 12, Lesson 5, Number 54 has been corrected in the new Enhanced Teachers Guide to say "At other positions on the major arc." Again thanks to Harold Jacobs for pointing this out.
- Chapter 14, Lesson 2, Number 22, 23 The method implied in the teacher's guide solution is based on dividing the polygon into triangles by drawing diagonals from one vertex. This is illustrated by exercises #38-51 of Chapter 7, Lesson 1 (pages 262-263).
- Downloads: Teacher's Guide, Solutions to Selected Problems
- Chapter 1 even numbered problems - Version 1 and Version 2 of the Solutions to Selected Odd Problems does not contain the solutions for the EVEN numbered problems assigned on the syllabus for chapter. The solutions are
as follows.
- Ch 1.1 #2 - True
- Ch 1.1 # 6 - True
- Ch 1.1 #8 - True
- Ch 1.2 #2 - Degree of 2
- Ch 1.3 #8 - (a-4b)(3c+d)
- Ch 1.2 #68 - The solution to this problem in the the "Solutions to Selected Problems" is incorrect. See the correct solution.
- Ch 1.6 Example 4 - More details on how the solution in the text is derived.
- Ch 2.1 #54 - The DVD covers this problem but what is written on the board has an error.
1.06x = 144 ERROR - should be 1.6x = 144
- Ch 2.6 #29 - Solution posted.
- Ch 2.6 #87 - Solution posted.
- Algebra II Test 2 - 2.7 #18 - Answer is +1.5i only. Need to test the -1.5i to see that it does not work - similar to #17.
- Ch 2.8 #57 - The solution in the old version (rev 041408) of the Solutions to Selected Problems is wrong. The final answer should be greater than or equal to 5 but less than or equal to 20. See the updated solutions manual at the link above.
- Ch 5.2 #27 - The solution in the old version (rev 041408) of the Solutions to Selected Problems is wrong. The final answer should be 2e^2x. See the updated solutions manual at the link above.
- Ch 5.5 #90 - The solution in the old version (rev 041408) of the Solutions to Selected Problems is wrong. The final answer should be k = 0.0485. See the updated solutions manual at the link above.
- Trig Test 2 - 7.2 #36. The solution posted to this problem in the Teacher's Guide has a typo. The first line of the solution should say cot(x-y) = cos(x-y) / sin(x-y).
- Ch 8.3 #33 - The solution for this problem is incorrect In Version 1 and Version 2 of the Solutions to Selected Odd Problems as well as in the published Student's Solutions Manual offered by McGraw Hill (ISBN: 0-07-242736-1).The correct answer is they will slide to the right. (See full solution.)
- Chapter 1 Quiz (note number 19 has the wrong solution!)
- Chapter 2 Quiz
- Chapter 3 Quiz
- Chapter 4 Quiz
- Chapter 5 Quiz
- Chapter 6 Quiz
- Chapter 7 Quiz
- Chapter 8 Quiz
Calculus 1
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