$\"\"$

The arithmetic sequence is $\"\"$

To find the common difference by subtracting successive terms.

$\"\"$

So, the common difference is negative 4. $\"\"$

Add $\"\"$ to the last term of the sequence to get the next term.

$\"\"$

The next three terms in the sequence are $\"\"$ . $\"\"$

The next three terms in the sequence are $\"\"$ .