Easy · Set 22

8 problems
1
Input: 6 → [?] → 8, what is the rule? =
2
Input: 4 → [?] → 14, what is the rule? =
3
Input: 6 → [?] → 12, what is the rule? =
4
Input: 10 → [+2] → ? =
5
Input: 3 → [?] → 9, what is the rule? =
6
Input: 6 → [+2] → ? =
7
? → [-3] → 0 =
8
Input: 9 → [?] → 8, what is the rule? =
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