Chapter 4 - An Introduction to Functions - 4-7 Sequences and Functions - Practice and Problem-Solving Exercises - Page 277: 24

Yes it is an arithmetic sequence, and the common difference is -2

The difference between consecutive terms is constant in an arithmetic sequence. The sequence: 10, 8, 6, 4, ... Finding the pattern: Difference between 1st and 2nd term: 2nd term-1st term=Difference 8-10= -2 Difference between 2nd and 3rd term: 3rd term-2nd term=Difference 6-8= -2 Difference between 3rd and 4th term: 4th term-3rd term=Difference 4-6= -2 The common difference is -2 and it is constant thus this is an arithmetic sequence.