#### Answer

Therefore the common difference is -6.

#### Work Step by Step

The sequence: 25, 19, 13, 7
To find the common difference, the difference between two consecutive terms are found.
Difference between 1st and 2nd term:
2nd term-1st term=Difference
19-25=-6
Difference between 2nd and 3rd term:
3rd term-2nd term=Difference
13-19=-6
Difference between 3rd and 4th term:
4th term-3rd term=Difference
7-13=-6
Therefore the common difference is -6.