1) Yes, it is arithmetic, the common difference is -3. To find this, subtract any number from the number after it.
32 - 35 = -3
2) yes, it is arithmetic, the common difference is -20. To find this, subtract any number from the number after it.
-23 - -3 = -20
3) yes, it is arithmetic, the common difference is -30. To find this, subtract any number from the number after it.
-64 - -34 = -30
4) yes, it is arithmetic, the common difference is -10. To find this, subtract any number from the number after it.
-40 - -30 = -10
yes, it is arithmetic, the common difference is -2. To find this, subtract any number from the number after it.
-9 - -7 = -2
yes, it is arithmetic, the common difference is 5. To find this, subtract any number from the number after it.
14 - 9 = 5
