How do you find the common difference and the three terms in the sequence given -25, -35, -45, -55,...?
The common difference is the difference between any two consecutive terms in an arithmetic sequence.
You can find it by subtracting any term from the next term.
This agrees with what we can see that the terms are getting smaller, with a difference of 10 every time.
It is not clear which three terms are being asked for.