2. Lesson Menu Main Idea Example 1:Look for a Pattern

3. Main Idea/Vocabulary Solve problems by looking for a pattern.

4. Example 1 Look for a Pattern AUDITORIUM The sixth-grade class is putting on a play and needs to arrange chairs in the auditorium. The first row has 17 chairs in it, and each row after that has 4 more chairs in it. Make a list of the number of chairs in each of the first 8 rows. UnderstandYou know how many chairs are in the first row, and that each row has 4 more chairs than the row before it. You need to find the number of chairs in each of the first 8 rows.

5. Example 1 Each row has 4 more chairs than the row before it. SolveUse a table to find the pattern. Look for a Pattern PlanLook for a pattern to find the number in each row. Answer:The number of chairs in each of the first 8 rows are 17, 21, 25, 29, 33, 37, 41, and 45.

6. Example 1 CheckEach row has 17 plus 4 more than the number of the row before it. So the eighth row should have 17 + 4(7), or 45 chairs. Look for a Pattern

7. Example 1 CYP EXERCISE Enrique jumps rope for 3 minutes the first week of his workouts, 5 minutes the second week, and 7 minutes the third week. If he continues to add 2 minutes each week, how many minutes will he jump in the tenth week? A.13 minutes B.15 minutes C.19 minutes D.21 minutes