Answer:
It's really easy, don't overthink it <3
Step-by-step explanation:
Number 17 is adding up by 5.
4, 9, 14, 19
4,(+5) 9,(+5) 14,(+5) 19
Number 18 is subtracting down by 9
2, -7, -16, -25
2,(-9) -7,(-9) -16,(-9) -25
If the next number in line is greater than the previous number, it's adding up.
If the next number in line is less than the previous number, it's subtracting down.
Bam
