# Unit 8 Sequences and Series Arithmetic Sequences ... Unit 8 Sequences and Series – Arithmetic Sequences and Series Notes Objective 1: Be able to recognize and write the rules for

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Unit 8 Sequences and Series – Arithmetic Sequences and Series Notes Objective 1: Be able to recognize and write the rules for arithmetic sequences, including finding the common difference, finding the nth term, and finding the number of terms of a given sequence. Examples of arithmetic sequences: 3, 7, 11, 15, 19, … -1, 5, 11, 17, 23, … 37, 28, 19, 10, … Note: all arithmetic sequences have a ______________________ __________________________. A rule (formula) can be written to find the nth term of an arithmetic sequence.

 11  ndaan Write the general rule and find a20 for each of the following sequences. 11, 14, 17, 20, 23, … -8, -1, 6, 13, 20, 27, … Find the first 5 terms of the sequence 32  nan and graph them.

a1 = a2 = a3 = a4 = a5 = Note: the graph is a set of discrete values with the domain being the set of positive integers. While it is a linear pattern, it is NOT a line!

• Write the rule for the arithmetic sequence given the 5th term of a sequence is 24 and the common difference is 6. Write the rule for the arithmetic sequence given the 7th term of a sequence is 41 and the common difference is -3. Write the rule for the arithmetic sequence given the 3rd term is 17 and the 9th term is 47. Write the rule for the arithmetic sequence given the 12th term is 32 and the 16th term is 56. Find the number of terms in the sequence: 8, 15, 22, 29, …288. Find the number of terms in the sequence: 11, 19, 27, 35, …211.

• Objective 2: Be able to find the sum of an arithmetic series, evaluate using summation notation – including within applications. Find the sum of 1 + 2 + 3 + 4 + … + 17 + 18 + 19 + 20 The formula to find the sum of an arithmetic sequences is nS

Use the formula to find the sum of the first 50 terms of the given series. 5 + 12 + 19 + 26 + … 50 + 42 + 34 + 26 + … Evaluate:

 

 100

1

56 n

n 342 50

1  

 n

n

Determine the number of terms in the series. 4 + 7 + 10 + 13 + 16 … Sn = 175

• 1. A theater has 25 seats in the first row and one additional seat in each successive row. The theater has 80 rows. a) How many seats are there in row 50? b) How many total seats are there in the theater? 2. An employee has a starting salary of \$40,000 and will get a \$3000 raise every year for the first 10 years. a) How much will the employee make in year 6? b) What will the employees total earned income over the 10 years? 3. A corner section of a stadium has 8 seats along the front row. Each successive row has two more seats than the row preceding. If the top row has 24 seats, how many seats are in the entire section? 4. Given 𝑎1 = 4 and 𝑎𝑛 = 𝑎𝑛−1 + 3, write the explicit formula. (from Common Core Flipbook) ##### 1. 2 Sequences and Series Arithmetic Sequences and Series Geometric Sequences and Series Counting Principles Probability 100 200 300 400 500
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