What is the common difference in the arithmetic sequence 30, 27, 24, 21, 18, ...
To find the common difference in an arithmetic sequence, you need to determine how much each term changes by to go from one term to the next.
In this arithmetic sequence, you can see that each term decreases by 3. From 30, the next term is 27 (30 - 3), then 24 (27 - 3), and so on. Therefore, the common difference is -3.
To find the common difference in other arithmetic sequences, you can apply the same process. Take two consecutive terms and subtract the first term from the second term to determine the difference between them. This will give you the common difference.