News & Resources
The Homeschool Math Problem
The U.S. schools are weak in math - almost all of them regardless of public, private, or homeschool. The national weakness in math (and science - which is related) is a growing problem. Math and science are required for all STEM (Science, Technology, Engineering, and...
Calc1 Test 4 / Final Exam #6c
Beverly asked: Looks like you have a simplification error in the second derivative. You have: f"(x)=12x^2-4=4(x-1) But it should be f"(x)=12x^2-4=4(3x^2-1) then the intervals for concavity all change. Am I missing something? Thank you so much for your good product and...
Calculus Test 4 Sections 4.9-5.8 – #3, #8b, #9a, #9b, #10b questions
Question from Beverly: #3 - on the test copy I have says to use three equal subintervals. But in the handwritten solution, it appears that they used 6. If the student uses 3 subintervals wouldn't the ∆X be 2 and the right endpoint sum be 0.2, left end point be 39.8,...
Geometry Ch14 Test #4
Question: how do we work the problem on Chapter 14 test #4. Answer from Harold Jacobs: Since all 16 white regions are identical, we can find the area of one of them and multiply it by 16. This figure represents one of the 16 small squares and one of the white regions....
Geometry Ch10.4 Sett III #4
Kerry Asked: In Chp. 10, Lesson 4, Set III Question 4 the textbook asks "Why is QD/AC = DB/CD?" Shouldn't it be DB/CB instead of DB/CD? Dr. Callahan Answered: Again you are correct. This is an error in the new printing of the 3rd edition by My Father's...
Geometry 10.2 Set III #4
Kerry wrote: For Ch. 10, Lesson 2, Set III number 4 asks for rectangles with a ratio of 3/4. The key says there are 4 rectangles that have dimensions of 1.5x2. ABHG is correct, but the other three rectangles seem to be wrong. The key lists BDJI (which doesn't even...
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