## Corrections

Early printings of the course guide did not include sample responses for each modeling prompt. To access these, visit the modeling prompt pages online (link).

Course Guide. In the Scope and Sequence, Unit 5 contains 13 days and no optional lessons. The total number of days in Algebra 2 is 124.

In the Course Guide, under Scope and Sequence, the Pacing Guide for Algebra 2 Unit 3 was edited to remove lesson 13 from the list of optional lessons.

Unit 1, Lesson 5, Lesson Synthesis. The indexing for each of the explicit formulas are now corrected to use \(n-1\) instead of \(n\). For example, the first geometric sequence is now \(f(n) = 2 \boldcdot 3^{n-1}\) instead of \(f(n) = 2 \boldcdot 3^n\).

Unit 1, End of Unit Assessment, Item 1. The solutions each gave a recursive formula for \(n \geq 1\), but should refer to \(n \geq 2\)

Unit 2, Lesson 8, Activity 3 Synthesis. In the second list item, change "Only changing the exponent to something 6 or higher would. . ." to "Changing the exponent to 6 would . . ."

Unit 2, Lesson 14, Practice Problem 6. Change the \(\text-15x\) inside the table to \(\text-5x\), and in the answer, change \(\text-3x\) to \(7x\).

Unit 2, Lesson 19. Change \(p(x)\) to \(q(x)\) throughout the lesson. Specifically:

- activity 2: narrative (2 places), task statement (2 places)
- activity 3: narrative (1 place), task statement (1 place), student response (3 places), synthesis (3 places)
- cool-down: task statement (1 place)

Unit 2, Lesson 19, Warm-up. The statement used the value 2772 instead of 2775.

Unit 2, Lesson 19, Practice Problem 4. Added to the problem statement: "(Note: Some of the answer choices are not used and some answer choices are used more than once.)"

Unit 2, Lesson 22, Warm-up. The statement incorrectly had a 1 in the numerator instead of a 3. The solution suggestions also mention \(x(x+2)\) instead of \(x(x-2)\). These have been corrected.

Unit 2, Lesson 23, Practice Problem 2. In the solution, change \(x^2+2x+1\) to \(2x^2+4x+2\).

Unit 3. Learning goals and learning targets updated from pilot versions.

Unit 3, Lesson 13, Activity 3. The solutions to parts 2 and 3 of Are You Ready for More? are updated to \(\text-6+i-9j+8k\) and \(\text-6+7i+9j+4k\), respectively.

Unit 3, Lesson 19, Activity 1. For the first function, \(f(x)=0\) when \(x = 0, \text{-}2\)

Unit 4, Lesson 8, Practice Problem 7. The solution to the second question should refer to 0.09375 picograms instead of 0.9375 picograms.

Unit 4, Lesson 10, Activity 1. For the explanation in the student response, the second bullet point had the 1 and 0 reversed. This is fixed.

Unit 4, Lesson 14, Practice Problem 2. The solution is \(d = \text{-}2\) instead of \(d = 0\).

Unit 4, Lesson 18, Practice Problem 4. The horizontal line \(y = 1,\!000\) should be used instead of \(y = 100\).

Unit 4, Mid-Unit Assessment, Item 7. The solution for the last part of the question used the incorrect initial value for the equation. This has been corrected.

Unit 4, End-of-Unit Assessment, Item 7. The equation should be \(A(d) = 100 \boldcdot e^{0.25d}\). The question and solutions are corrected.

Unit 5, Lesson 3, Practice Problem 3. The correct point for Han is \((1,85)\).

Unit 5, Lesson 7, Activity 1. The statement (and solution) had the last part of the table listed in the wrong order. This has been corrected to ask for translations first, then reflections.

Unit 5, Lesson 7, Lesson Synthesis. The order of the transformations for the third function has been corrected to do translations before reflection.

Unit 5, Lesson 7, Practice Problem 3. Correct answers should open down with a negative leading coefficient. A possible response is \(y = \text{-}(x-2)^2 - 3\).

Unit 5, Lesson 9, Practice Problem 1. The solution to b should be \(k = 0.625\) and the solution to d should be \(k = \text-\frac{1}{2}\).

Unit 5, Lesson 11, Practice Problem 6. The graph is compressed horizontally by a factor of \(\frac{1}{3}\).

Unit 6, Lesson 1, Practice Problem 5. Option d is updated to \(k(x) = \frac{3x^2 - 16x + 12}{x-6}\) and choice 6 is updated to, "The graph approaches \(y = 3x+2\)."

Unit 6, Lesson 3, Practice Problem 7. Exchanged the names of side lengths \(d\) and \(e\) so that \(d\) is across from angle \(D\) and \(e\) is across from angle \(E\).

Unit 6, Lesson 11, Practice Problem 5. The solution to part d now correctly has a 2 in the denominator instead of a 4.

Unit 6, Lesson 12, Practice Problem 7. The solution to c is corrected to, "...translated 6 units to the left."

Unit 6, Lesson 19, Practice Problem 2. Added D as a correct response.

Unit 6, Lesson 19, Practice Problem 5. The solution points are S and T instead of U and V.

Unit 7, Lesson 1, Practice Problem 6. Added D as a correct response.

Unit 7, Lesson 3, Activity 3. The sample solutions are updated. 2a is 14.6 square meters and 2d is 8.2 square meters.

Unit 7, Lesson 14, Practice Problem 3. The solution to b is 0.0041.

Unit 7, Lesson 14, Practice Problem 4. Updated part b to read, "...difference at least as great as the difference in means between the control and treatment groups?" Added additional tick marks on the \(y\)-axis of the image. Updated solution to part b to \(\frac{46}{100}\)

Unit 7, Lesson 14, Activity 3. Solutions are updated to use the correct area of 0.0084 for questions 2 through 4.

Unit 7, Lesson 15, Practice Problem 3. The solution to part e is updated to 0.005.