What are the next 3 terms for and arithmetic sequence-18, -13, -8, -3

Question

I just need help becuae I have no clue on what I am doing. Help me please :) :(  

i have 

Answer 1

-18, -13, -8, -3

 

Next 3 terms are 2,7,12

 

-18 + 5 =-13

-13+5 =-8

-8+5 =-3

-3+5 =2

2+5 =7

7+5 =12