Lesson 2

• What is the focus of Lesson 2 in the study of arithmetic sequences?

  To illustrate arithmetic sequences and determine their nth term, arithmetic means, and sums.
• How is a sequence defined in mathematics?

  A sequence is an arranged list of numbers that may be finite or infinite.
• What is a finite sequence?

  A finite sequence has a first term and a last term.
• What is an infinite sequence?

  An infinite sequence has a first term but no last term.
• What is the common difference in an arithmetic sequence?

  The common difference is the constant difference between any two consecutive terms.
• What is an arithmetic sequence?

  An arithmetic sequence is a sequence where every term after the first is obtained by adding a constant called the common difference.
• What happens to an arithmetic sequence if the common difference is positive?

  The sequence is said to be increasing.
• What happens to an arithmetic sequence if the common difference is negative?

  The sequence is said to be decreasing.