News & Resources
Algebra Ch5.6 #9
For problem 5.6, parts a-d are all pretty much the same. Here I will do part d) since a hair more complex. The steps the same for the others. Since AB = CD, we can substitute the following AB is x + 6(x+2) CD is 2(x+10) To get x + 6(x+2) = 2(x+10) So to find the...
Geometry 14.2 #22-23
Question from Joy: We are in Geometry 3 rd edition. Chapter 14 lesson 2 number 22-23. Page 582. How do you get 108? The answer in key says 3 x 180/5? Why? I think I missed something important yet simple. I was thinking divide 360/5. What an I doing wrong? Thanks!...
Geometry Ch13.6 #32
For Chap 13, Lesson 6, #32, the basis for the answers is the figure for #6. If we look carefully at the grid, applying the Pythagorean Theorem gives XY^2 = 2^2 + 2^2 = 8, so XY = sqrt8 = 2sqrt2. YZ^2 = 1^2 + 1^2 = 2, so YZ =sqrt2. Therefore XY = 2YZ.Harold Jacobs...
The Different Geometry Textbooks and Videos
The 3rd edition of the Harold Jacobs Geometry textbook has gone through three different printings with 3 different covers and ISBNs. If you are picking a text and looking at used options, it can be confusing. So let me try to help. First, all 3 versions are basically...
Geometry Ch8 Review #32
Question from Jennifer: Chap 8 review #32 We aren’t sure how the answer would be 24mm. Answer: This is not explained well in the textbook. First - the translation is the movement of the bat from position B to position C (see chap 8, Lesson 2) A translation is two...
Geometry Ch5.1 #29
Question from Courtney I'm having trouble with Chapter 5, Lesson 1, Problem 29. I have worked the problem, I know what the answer should be, but given the figure, I don't understand how that could be false. Without the figure, I understand it. Answer: You can never...
Let’s Learn Together!
Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada. Proin eget tortor risus.