For numbers 1-5, determine whether or not the sequence given is arithmetic, and (if it is) find the common difference. For numbers 6-10, give the nth term rule for the given arithmetic sequence.
1. {3,-4, -5, -6...)
2. {1/2,5/2, 4, 11/2...}
3. {-2, -10,-18,-28...}
4. {1.5,3,4,5,6}
5. {2, 1, 1/2, 1/4...)
6. {5, -2, -9,-16...)
7. a=3 d= -2
8. A(12) = -14 d=1/3
9. A(9) = 1.5 d=3
10. A(4) = -30 d=-12/7