This page contains a list of typos or errors from my books. The edits will be incorporated in future editions.

SAT Math: The Advanced Guide and Workbook

Chapter 8 More Equation Solving Strategies, #4 (pg. 65): The answer explanation has a typo. The -4 should turn into a +4 when it’s brought over to the other side. The last step is correct, as well as the answer.

Chapter 3 Exponential vs. Linear Growth (pg. 26): The final amount \(A\) would be \(A = 100 – 10t\)

Chapter 23 Reading Data (pg. 212): The question should read, According to the graph, by how many hours is Greg’s glucose recovery time after lunch greater than his glucose recovery time after breakfast? The answer explanation should be adjusted accordingly.

The following errors have now been fixed for this book (Sep. 8, 2016)

Chapter 20 Triangles, #30 (pg. 186): The equilateral triangle is AED, not BEC.

Chapter 22 Trigonometry (pg. 200): Step 2 for finding the value of a trig function without a calculator is incorrect. Step 2 should be “Find the reference angle“.

Thus, the examples were done incorrectly. In example 1, the reference angle is \(30^\circ\). So \(\sin 330^\circ = -\sin 30^\circ = -\dfrac{1}{2}\)

Chapter 22 Trigonometry, #6 (pg. 202): \(AB = 5\), as shown in the diagram, NOT 4 as the question states.

SAT Writing: Advanced Guide and Workbook

Chapter 14 Commas, Dashes, & Colons, #5 (pg. 87): Answers A and C are duplicated. Answer C shouldn’t have a comma at the end.

Chapter 23 Comparatives vs. Superlatives, #7 (pg. 178): The word “the” is duplicated.

SAT Math: 10 Practice Tests

Practice Test 1, Section 3, #4: The answer listed is correct but the explanation refers to another problem. For this question, \(x = 2, y = 3, z = -4\) so \(x + y + z = \boxed{1}\)

Practice Test 1, Section 4, #14: The answer listed is correct but the explanation should say “tripling per hour,” not “doubling per hour.”

Practice Test 4, Section 4, #28: The question should read \(AB = BC\)

Practice Test 7, Section 3, #9: All answer choices should have \(t\) in the denominator, not \(b\).

Practice Test 8, Section 4, #33: The question should read \(\sin 24^\circ = \cos(3k + 6)^\circ\) (Note the parentheses).

Practice Test 8, Section 4, #38: The question should be clearer: What is the velocity of the block, in meters per second, immediately after the spring is uncoiled from its currently displaced position of 0.05 meters?

Practice Test 9, Section 4, #33: The question should read “what is the minimum possible value of \(x\)?” The answer is 14, but the answer explanation should be interpreted accordingly.

Special thanks to Aung for most of these edits!

ACT English

Chapter 4 Prepositional Phrases, #6 (pg. 19): “Since the hypothesis” is a prepositional phrase that should also be crossed out in the answer.

Chapter 15 Commas, #15 (pg. 84): The correct answer is B, not A.

Chapter 18 Word Choice, Exercise 2

1. C
2. A
3. B
4. A
5. B
6. B
7. A
8. D
9. C
10. B
11. D
12. C
13. A
14. B
15. C
16. B
17. D