Answer: 9
Step-by-step explanation: The common difference is the difference between each of the terms in an arithmetic sequence.
Let's work backwards.
First, we take the last term we are given and
subtract the second to last term.
So here, we subtract 23 - 14 to get 9.
Now, we take 14 - 5 to get 9.
Notice that 9 is our answer in both problems above.
That means it's our common difference.