Describe the pattern each sequence manifests.

Question

-1,-3,-5,...___________
2,1,0,...________________
-1,2,3,...___________
-5,-2,1,4,...__________
-1,2,7,...________
3,8,15,..._________

Answer 1

keep adding -2 each time. a_n = -(2n-1)
The next three are just the same idea.
The last one is a bit different. Note that each term is one less than a power of 2.