What do we have in common? You need matchsticks in this activity. 1. Below are squares formed by matchsticks. count the number of matchsticks in each figure and record the results in a table. 8 9. 10 3. 4 6. Number of Squares 1 Number of Matchsticks Guide Questions: 1. Is there a pattern in the number of matchsticks? If there is any, describe it. 2. How is each term (number of matchsticks) found? 3. What is the difference between any two consecutive terms? Now you will learn the rule for finding the nth term of an arithmetic sequence. In general, the first n terms of an arithmetic sequence with a as the first term and d as common difference are an = a1+ (n– 1)d

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