Chapter 11 Sequences and Series
11.1 Arithmetic Sequences
Key Terms Sequence: an ordered list of numbers 1, 3, 5, 7, 9, …. Terms: the numbers in the sequence The 1 st term in the sequence above is 1, 2 nd is 3, 3 rd is 5, etc Arithmetic Sequence: a sequence in which each terms after the 1 st is found by adding a constant Common difference: the number added to each term in an arithmetic sequence
Arithmetic sequence Formula: a n = a 1 + (n – 1)d a n = specific term (nth term) a 1 = 1 st term in the sequence n = number of position for given term d = common difference
Find the next four terms in the sequence. -6, -2, 2,…. 1.6, 1.1, 0.6, ….
Write an equation for the nth term 10, 7, 4, 1, …
Write an equation for the nth term 8, 17, 26, 35, …
The table shows typical costs for a construction company to rent a crane for one, two, three, and four months. If the sequence continues, how much would it cost to rent the crane for a year? The construction company has a budget of $350,000 for crane rental. The job is expected to last 18 months. Will the company be able to afford the crane rental for the entire job? Explain. MonthsCost ($) 175, , , ,000
Find the first 5 terms for the sequence described a 1 = 2 d = 13 Find the indicated term for the sequence a 1 = 20, d = 4, n = 81
Arithmetic Means The terms between any two non- successive terms in an arithmetic sequence Use the formula to find the common difference Then use the common difference to calculate the arithmetic means
Find the arithmetic means between the given terms 16,__, __, __, __, 91, … 15.6, __, __, __, 60.4,...