1. Opener Simplify or Solve: 1. x + 3(x – 6) 2. 4x + 5 = -9 3. (3 + x)y + x² + 2xy 4. 6(x + 2) + 4x + 9 5. 2x + x – 6 = 3 6. –(x + 7) = -3

2. Opener-Answers 1.x + 3(x – 6) x + 3x – 18 4x – 18

3. Opener-Answers

4. 3. (3 + x)y + x² + 2xy 3y + xy + x² + 2xy 3y + xy + 2xy + x² 3y + 3xy + x² x² + 3xy + 3y

5. Opener-Answers 4. 6(x + 2) + 4x + 9 6x + 12 + 4x + 9 6x + 4x + 12 + 9 10x + 21

6. Opener-Answers

8. Ch. 12.2 Circumference of a Circle Page 596

9. Problem 1 - page 596 Obtain a string and centimeter ruler for each member of your group… Recall that the circumference of a circle is the distance around the circle. Let’s explore circles. Use a string and centimeter ruler to measure the radius and circumference of each circle. Measure circles #1, 3 and 5 only. (Circles A, C & E only.)

10. Problem 1 - page 596 Obtain a string and centimeter ruler for each member of your group… CircleRadiusDiameterCircumference Circle 1 (A) Circle 3 (C) Circle 5 (E) 6.Record your measurements from Questions 1 through 5 and complete the table.

11. Skip Problem 2-pages 599-601 Page 602 Problem 3…read for me please… 1.Use this information to write a formula for the circumference of a circle, where d represents the diameter of a circle and C represents the circumference of a circle. 2. Rewrite the formula for the circumference of a circle where r represents the radius of a circle and C represents the circumference of a circle.

12. Still on page 602 C = (4.5)(3.14) C = 14.13 cm 4. The radius of a circle is 6 inches. Compute the circumference of the circle using the circumference formula. C = (2)(3.14)(6)

13. STILL on page 602! 5. The circumference of a circle is 65.94 feet. Compute the diameter of the circle using the circumference formula. Work on #6 & 7 in your groups until the end of class. If you finish, work on your homework.