Answer:
-20, -40, -80
Explanation:
as we see in the whole number (aka positive number) area, its counting by twenties because it goes from 0-20. since were in the negative area we would want to count up backwards,
so, 0 minus 20 equals -20
-20 minus -20 equals -40
and -20 minus -60 equals -80
hope this helped! <3