Answer:
the next three would be -13,-17, and -21.
Step-by-step explanation:
The numbers are decreasing consecutively by 4.
Each term in the sequence is 4 less than the previous term, so that is the pattern.
-9 - 4 = -13.
-13 - 4 = -17.
-17 - 4 = -21.
Those are the next three terms.
