Answer:
17)-3,0,3
18)-9,-3,9
19)-6, -3, 1, 3
20) -9, -5, -1, 0
21) -4, -3, -2, -1,0
22)-15, -10, -5, 10
Explanation:
if your getting confused, just imagine a number line in your head or write one on your paper, that has negative numbers on the left side and positive numbers on the right side
(ex: ....-3, -2, -1, 0, 1, 2, 3....)
remember that the number that is in the left side is always less than the the number on the right side, meaning the number on the right side of the number line is greater than the number on the left side.