Determine if the sequence below is arithmetic or geometric and determine the common difference / ratio in simplest form.
15, comma, 11, comma, 7, comma, point, point, .
15,11,7,...
This sequence is arithmetic because there is a common difference between each term.
To find the common difference, we need to subtract each term from the previous term:
11 - 15 = -4
7 - 11 = -4
Therefore, the common difference is -4.