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 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