I am having trouble working on number patterns. I have to find the last three numbers of each pattern:

Question

1)17,16,13,12 2)1,2,4,7 3)1,4,9,16
4.) 8,27,64 please help I don't understand amd my parents are trying their best to help me

4) this is a sequence of cubes, 2 cubed, 3 cubed, 4 cubed, ...

3) This is a sequence of squares..1 squared, 2 squared, ...

Thank You