Supply the next three letters, figures, symbols or combination of numbers and letters in the following

Answer:
1. K,M,P
2.←↑
3.5d,6e,7f
4.4x,5x,6x
5.30,35,40
V. Assess
1.50,60,70
2.8,4
3.-8,-10,-12
4.14,17,20
5.5/5,6/5,7/5
I'm not sure if my answer in number 5 is correct but you can correct my if I'm wrong