Answer
-9
Work Step by Step
6,3,0,-3,-6,_
every next number is less than 3 from the previous number
so -6 -3 =-9
so -9 is the next number
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.