## Corrections

Note: Later printings of these materials may have some of these corrections already in place.

Unit 1, Lesson 2, Activity 2. In the activity synthesis, instead of "point out that again left and right are reversed . . ." it should say "point out that the mirror line is now a horizontal line: in Frame 5 the beak is pointing down, and in Frame 6 the beak is pointing up, with the head on the right of the body in both cases. Contrast this with a rotation through \(180^\circ\), which would put the head on the left of the body."

Unit 1, Lesson 4, Practice Problem 3. The images in the student response should have all the labels C and D swapped.

Unit 1, Lesson 9, Practice Problem 1c. In the student response, instead of \(AB\) it should say \(A'B'\).

Unit 1, Lesson 12, Activity 3. In the student response, the answers for #3 and #4 should be switched.

Unit 1, Lesson 14, Activity 2. In the activity narrative, instead of "translate \(B'\) to \(E'\) in the second picture" it should say "translate \(B\) to \(E\) in the third picture."

Unit 1, Lesson 16, Activity 4. In the student response, instead of \(ACD\) it should say \(ACB\).

Unit 1 Glossary. In the definition of "coordinate plane" instead of "to the left" it should say "to the right."

Unit 2, Lesson 2, Warm-up. In the student response, instead of "4 lines" it should say "6 lines."

Unit 2, Lesson 6, Activity 4. In the student response for Partner B #2, instead of "scale factor 3" it should say "scale factor \(\frac13\)."

Unit 2, Lesson 6, Cool-down. In the student response, instead of \(EFGH\) it should say \(EFGD\).

Unit 2, Lesson 10, Activity 2. In the student response for #1, instead of "angles \(ECD\) and \(HFG\)" it should say "angles \(CED\) and \(FHG\)."

Unit 2, Lesson 11, Activity 2. In the activity narrative, instead of "divide the \(x\)-coordinate by the \(y\)-coordinate" it should say "divide the \(y\)-coordinate by the \(x\)-coordinate."

Unit 3, Lesson 2, Activity 2. In the activity synthesis, instead of \(y = \frac12 x\) it should say \(y = \frac14 x\) and instead of "double" it should say "four times."

Unit 3, Lesson 4, Activity 2. In the student response for #1, instead of "\$16.50" it should say "\$16.80."

Unit 3, Lesson 12, Activity 2. In the student response for "Are you ready for more?" #3, instead of "intercepts are at 20 instead of 10" it should say "intercepts are at 20 and 10 instead of 10 and 5."

Unit 4, Lesson 2, Warm-up. In the student response, instead of "on its left side" it should say "on its right side."

Unit 4, Lesson 14, Cool-down. In the student response, instead of "divide each side by 2" it should say "divide each side by 3."

Unit 5, Lesson 1, Activity Cool-down. In the student response, instead of "the input should be" it should say "the output should be."

Unit 5, Lesson 7, Activity 4. In the student response for #4, instead of "4.1 miles" it should say "3.0 miles."

Unit 5, Lesson 16, Activity 3. In the activity narrative, instead of "generic cylinder" it should say "generic cone." Also, in the task statement, instead of \(36\pi\) it should say \(144\pi\).

Unit 5, Lesson 17, Activity 3. In the activity synthesis, instead of "we can rewrite \(V=78.5h\)" it should say "we can rewrite \(V=78.5(2h)\)."

Unit 5, Lesson 18, Activity 2. In the student response for #1, instead of "four times bigger" it should say "nine times bigger."

Unit 5, Lesson 20, Activity 2. In the activity narrative, instead of "the volume of the cylinder from the volume of the cone" it should say "the volume of the cone from the volume of the cylinder."

Unit 5, Lesson 21, Activity 4. In the student response for #4, instead of \(\frac{20}3\pi\) it should say \(\frac{32}3\pi\).

Unit 5, Lesson 22, Activity 2. In the student response, the volume was missing for the radius of 100. It should say \(\frac{4,000,000}{3}\pi\) in the answer table. Also, instead of \(\frac{1}{24\pi}\) it should say \(\frac{1}{4\pi}\) in two places.

Unit 5, Lesson 22, Activity 3. In the student response for #4, the second "1.5" should say "4.5." For #6, instead of "116" it should say "113."

Unit 5, Lesson 22, Activity 3. In the activity synthesis, in the second bullet point instead of "cylinder" it should say "cone."

Unit 6, Pre-unit assessment. In the solution for #3, instead of "\$ per week" it should says "\$4 per week."

Unit 6, Lesson 9. In the lesson synthesis, instead of "13 to 15 years old that do not have a cell phone" it should say "13 to 15 years old that have a cell phone."

Unit 7, Lesson 5, Activity 3. Add question 3b, "Write \(10^{\text-4} \boldcdot 10^3\) as a power of 10 with a single exponent. Be prepared to explain your reasoning."

Unit 7, Lesson 7, Activity 3. In the student response for #3, instead of \(5 \boldcdot 5 \boldcdot 5 \boldcdot 5 \boldcdot 5 \boldcdot 10 \boldcdot 10 \boldcdot 10 < 50 \boldcdot 50 \boldcdot 50 \boldcdot 50 \boldcdot 50 \boldcdot 50 \boldcdot 50 \boldcdot 50\) it should say \(\frac12 \boldcdot \frac12 \boldcdot \frac12 \boldcdot \frac12 \boldcdot 10 \boldcdot 10 \boldcdot 10 < 5 \boldcdot 5 \boldcdot 5 \boldcdot 5 \boldcdot 5 \boldcdot 5 \boldcdot 5\).

Unit 7, Lesson 12. In the student lesson summary, insert parentheses in one expression. Instead of \(2 \boldcdot 10^{12} \div 3 \boldcdot 10^8\) it should say \((2 \boldcdot 10^{12}) \div (3 \boldcdot 10^8)\).

Unit 7, Lesson 15, Activity 3. In the student response for #2, instead of \(17.7363 \times 10^4\) \( = 1.77363 \times 10^5\) it should say \(17.9363 \times 10^4\) \( = 1.79363 \times 10^5\) .

Unit 7, Lesson 16, Activity 1. In the student response for "2016 Desktop" instead of 600 it should say 6,000.

Unit 8, Lesson 2, Practice Problem 5a. In the student response, instead of "more people" it should say "km^{2}."

Unit 8, Lesson 2, Practice Problem 5b. In the student response, instead of 2.808 it should say 2.803.

Unit 8, Lesson 6, Activity 2. In the student response for #4, instead of \(b^2 = 4\) and \(c^2 = 8\) it should say \(b^2 = 9\) and \(c^2 = 13\).

Unit 8, Lesson 6, Cool-down. In the image, instead of \(\sqrt {45}\) it should say \(\sqrt {41}\).

Unit 8, Lesson 9, Practice Problem 1. In the student response, instead of \(9^2+12^{12} =14^2\) it should say \(9^2+12^2 =14^2\).

Unit 8, Lesson 10, Activity 2. In the student response for #2, the first "5 meters per second" should say "7.5 meters per second."

Unit 8, Lesson 10, Activity 2. In the student response for "Are you ready for more?" #1, instead of "8.06 seconds . . . 1 meter . . . 128.06 seconds . . . 120 seconds" it should say "1.6 seconds . . . 5 meters . . . 25.6 seconds . . . 24 seconds." For #2, instead of "1.4 meters . . . \(\frac{180}{1.4} \approx 128.57\) . . . lose to" it should say "7.03 meters . . . \(\frac{180}{7.03} \approx 25.6\) . . . beat."